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saifoo.khan

  • 2 years ago

Differentiate: sin(x)*cos(2x)

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  1. RolyPoly
    • 2 years ago
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    \[\frac{d}{dx}sinxcos(2x) = \frac{d}{dx}sinx(1-2sin^2x)\]Does that help?

  2. saifoo.khan
    • 2 years ago
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    Umm. Sorry no. I have to use the chain rule. @RolyPoly

  3. saifoo.khan
    • 2 years ago
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    @yummydum : That won't work. :P

  4. yummydum
    • 2 years ago
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    i realized that :P

  5. RolyPoly
    • 2 years ago
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    \[\frac{d}{dx}sinxcos(2x) = cos(2x)\frac{d}{dx}sinx+sinx \frac{d}{dx}cos(2x)\]This?

  6. saifoo.khan
    • 2 years ago
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    Pretty late though. @yummydum

  7. yummydum
    • 2 years ago
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    uff acha bhai mein chali jaati hoon..khush?

  8. RolyPoly
    • 2 years ago
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    You have to use chain rule for the second term lol

  9. saifoo.khan
    • 2 years ago
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    Yes! @RolyPoly I got till: \[uv'+vu'\]\[\sin x(-2\sin(2x))+ \cos(2x)(\cos x)\]

  10. saifoo.khan
    • 2 years ago
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    @yummydum : RUKO! Sath chalte hain. ;)

  11. yummydum
    • 2 years ago
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    kahan leja rahe ho?

  12. saifoo.khan
    • 2 years ago
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    In the second term? is my working correct? @RolyPoly

  13. RolyPoly
    • 2 years ago
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    Yes, I think so..

  14. saifoo.khan
    • 2 years ago
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    Jehan aap farmaish karain. @yummydum

  15. saifoo.khan
    • 2 years ago
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    What will the step after that? I'm stuck till there. @RolyPoly

  16. technofable
    • 2 years ago
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    yea it's right

  17. RolyPoly
    • 2 years ago
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    sin2x = 2sinxcosx cos2x= 2(cosx)^2 -1

  18. RolyPoly
    • 2 years ago
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    \[=-2\sin x\sin(2x)+ \cos(2x)(\cos x)\]\[=-2\sin x(2\sin x \cos x)+ (2cos^2x-1)(\cos x)\]

  19. RolyPoly
    • 2 years ago
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    For the first term, you'll get -4(sinx)^2 cosx (sinx)^2 = 1-(cosx)^2

  20. RolyPoly
    • 2 years ago
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    Then you can express it in terms of cosx, if that's what you want.

  21. saifoo.khan
    • 2 years ago
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    Ohhh. Right. Thanks @RolyPoly and @technofable

  22. saifoo.khan
    • 2 years ago
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    idk what does that mean.. @yummydum Dubai chaltay hain. =D

  23. RolyPoly
    • 2 years ago
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    Welcome..

  24. yummydum
    • 2 years ago
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    nahi yaar bus pakistan lejao phir tum free

  25. saifoo.khan
    • 2 years ago
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    Haha. Done. Kab chalna hai? @yummydum

  26. yummydum
    • 2 years ago
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    bus $2,000 mujhe de do baki sub khair hai, mein khud khayal kar loongi ...free biryani as a compliment ;)

  27. saifoo.khan
    • 2 years ago
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    Lmao. $2000 ki tou main zindagi bhar ki biryani kha sakta hoon. :P @yummydum

  28. yummydum
    • 2 years ago
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    $2000 main mein pakistan jaa sakti hoon aur shopping bhi poori....us mein se agar bacha tou tumhe biryani khiladoon gi :P

  29. saifoo.khan
    • 2 years ago
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    No thank you. Tumhari tokri main hole hoga, but Allah ka shukr mairi tokri main nahi hai.

  30. yummydum
    • 2 years ago
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    haha..chalo jao tum dubai chale jao..uri ko saath le jana :P

  31. saifoo.khan
    • 2 years ago
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    Lmao. Tum bhi chalo naa.

  32. yummydum
    • 2 years ago
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    mein tumhari kya lagti? :P

  33. saifoo.khan
    • 2 years ago
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    Uri mairi kia lagti?

  34. yummydum
    • 2 years ago
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    mein kya jaanoon? :P i dont go into private files

  35. saifoo.khan
    • 2 years ago
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    Hahaha. Aisa kabhi ho sakta hai k koi larki kabhi private files main na jaye?!

  36. yummydum
    • 2 years ago
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    LMAOO

  37. yummydum
    • 2 years ago
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    i respect private/personal space

  38. saifoo.khan
    • 2 years ago
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    Oh please. No girl is like that. I can list million of examples.

  39. saifoo.khan
    • 2 years ago
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    And since you belong to the same race, you can't be one. =D

  40. yummydum
    • 2 years ago
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    exactly why i tell you im different...sunnay ko taiyaar nahi ho, i know, but still its true :P

  41. yummydum
    • 2 years ago
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    to be a girl is not a race..its a species :P

  42. saifoo.khan
    • 2 years ago
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    OMG! EVERY OTHER girl EVERY OTHER says that she's not like "other girls" . Lol And you're saying the same thing!

  43. yummydum
    • 2 years ago
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    im not "like other girls"...im just not like girls at all :P

  44. saifoo.khan
    • 2 years ago
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    Wait! You're not like girls? Then? Are you like boys? lmao.

  45. yummydum
    • 2 years ago
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    tom boy

  46. yummydum
    • 2 years ago
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    acha ji mujhay kaam kerna hai, kisi aur ko dhoondo yeh sab bak bak kernay k liye :P

  47. saifoo.khan
    • 2 years ago
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    Haan haan. "larkon walay" kaam karnay hongay. :P Jao bhai. Kaam karo.

  48. yummydum
    • 2 years ago
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    if school work is "larkon walay kaam" then yes :P

  49. saifoo.khan
    • 2 years ago
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    Bhahiyon ki tarhan speed main kaam kia hai bhai apnay. Hats off.

  50. yummydum
    • 2 years ago
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    LOL

  51. saifoo.khan
    • 2 years ago
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    Haan waisay bhi larkiyan konsa parti hain.. Unhain ultay seedhay kaamon say fursay milaygi tou parhnay ka sochainge. :P

  52. yummydum
    • 2 years ago
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    uff itni nafrat lol :P

  53. saifoo.khan
    • 2 years ago
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    Lol. Not nafrat. Facts. Mairi konsa larkiyon say koi dushmani hai? ;D

  54. yummydum
    • 2 years ago
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    abhi nahi hai..jab shaadi ho jaegi tou phir poochna khud say k ab kuch nafrat hai ya nahi ;P

  55. saifoo.khan
    • 2 years ago
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    Nahi nahi, InshAllah aisa kuch nahi hoga. "She and I will live happily ever after <3". Lagta hai tumhain bara experience hai. 2-3 shadiyan kar chuki ho kia?

  56. yummydum
    • 2 years ago
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    LOLOLOLOLOL

  57. yummydum
    • 2 years ago
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    good to hear tum mein insaaniat hai :P

  58. saifoo.khan
    • 2 years ago
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    Alhamdulliah, achi wali hai. Tumhara husband jald suicide kar laiga. Tension na lo. :p

  59. yummydum
    • 2 years ago
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    Kaminay!

  60. saifoo.khan
    • 2 years ago
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    Haha. Aisa usko baar baar bologi tou aur jaldi kar laiga. ;D

  61. yummydum
    • 2 years ago
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    dont worry tumhari wali mere wale se pehli khudkushi kerlaigi :P

  62. yummydum
    • 2 years ago
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    ye shaadi hui nahi k time for funeral :P

  63. saifoo.khan
    • 2 years ago
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    Nah. Mairay sath itni khushi hogi k usko suicide ki zaroorat he nahi paregi.

  64. yummydum
    • 2 years ago
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    uff

  65. saifoo.khan
    • 2 years ago
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    Wait! Are you even going to get married? I doubt it.

  66. saifoo.khan
    • 2 years ago
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    MashAllah MashAllah. ;D

  67. yummydum
    • 2 years ago
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    abhi nahi for sure :P ...ill wait till im in my 20's...kaafi time para hai :D

  68. yummydum
    • 2 years ago
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    tumhara to lag raha hai kal shaadi hai :P

  69. saifoo.khan
    • 2 years ago
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    5~ saal tou hain. Tayyari start kardo! I wish. Ho jaye tou bohat he acha hai. ;D

  70. yummydum
    • 2 years ago
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    why so ready to get married? :P

  71. yummydum
    • 2 years ago
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    aur ji nahi abhi kuch 6-7 saat hein mere paas :)

  72. saifoo.khan
    • 2 years ago
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    Why shouldn't i be? aagay ka time kisne daikha hai? Hum rahain na rahain. ;D If you know what i mean.. Haha, haan haan.. pooray 20 saal he karlo. :p

  73. yummydum
    • 2 years ago
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    no i dont know what you mean...?

  74. saifoo.khan
    • 2 years ago
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    Like kia pta after 5-6 years you are alive or not. Phehlay karo, baad main karo karni tou hai he na. Tou for safety precautions, phehlay he karlo. Time bachao. :D

  75. yummydum
    • 2 years ago
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    LOL ...sahi

  76. saifoo.khan
    • 2 years ago
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    Ikr. Sahi like always. Ab nazar na lagao.

  77. yummydum
    • 2 years ago
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    nazar bhoolo ab thappar pare ga :P

  78. saifoo.khan
    • 2 years ago
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    I would love to get a thappar. ;D

  79. saifoo.khan
    • 2 years ago
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    Or thappars..

  80. yummydum
    • 2 years ago
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    kyun?

  81. saifoo.khan
    • 2 years ago
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    Why not? Thappar he tou hai.

  82. saifoo.khan
    • 2 years ago
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    But wait! Don't even dare to touch me. Mujhay koi deadly disease nahi lagwani.

  83. yummydum
    • 2 years ago
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    zor ka parta hai, soch lo? ...khair get used to it..jo aegi wo khud bohot mare gi :P

  84. yummydum
    • 2 years ago
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    mujhay koi zarurat nahi hai tumse disease lene ki so dont worry...tumhari jo aegi (agar aegi :P) wo khud mera kaam poora kerday gi

  85. saifoo.khan
    • 2 years ago
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    Haan haan. No worries. Bohat zoor zoor walay khaye hain.. Aur tumhara tou simple hai.. Haha. Disease mujhay lagay gi TUM say. InshAllah ayegi. And aisa koi kaam pura nahi karnay wali wo.

  86. yummydum
    • 2 years ago
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    uff..chalo ro nahi :P ...i have to go..tum jao usse dhoodo ;P

  87. saifoo.khan
    • 2 years ago
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    Haha. I'm going too. Nite. :')

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