saifoo.khan
  • saifoo.khan
Differentiate: sin(x)*cos(2x)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
\[\frac{d}{dx}sinxcos(2x) = \frac{d}{dx}sinx(1-2sin^2x)\]Does that help?
saifoo.khan
  • saifoo.khan
Umm. Sorry no. I have to use the chain rule. @RolyPoly
saifoo.khan
  • saifoo.khan
@yummydum : That won't work. :P

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anonymous
  • anonymous
i realized that :P
anonymous
  • anonymous
\[\frac{d}{dx}sinxcos(2x) = cos(2x)\frac{d}{dx}sinx+sinx \frac{d}{dx}cos(2x)\]This?
saifoo.khan
  • saifoo.khan
Pretty late though. @yummydum
anonymous
  • anonymous
uff acha bhai mein chali jaati hoon..khush?
anonymous
  • anonymous
You have to use chain rule for the second term lol
saifoo.khan
  • saifoo.khan
Yes! @RolyPoly I got till: \[uv'+vu'\]\[\sin x(-2\sin(2x))+ \cos(2x)(\cos x)\]
saifoo.khan
  • saifoo.khan
@yummydum : RUKO! Sath chalte hain. ;)
anonymous
  • anonymous
kahan leja rahe ho?
saifoo.khan
  • saifoo.khan
In the second term? is my working correct? @RolyPoly
anonymous
  • anonymous
Yes, I think so..
saifoo.khan
  • saifoo.khan
Jehan aap farmaish karain. @yummydum
saifoo.khan
  • saifoo.khan
What will the step after that? I'm stuck till there. @RolyPoly
anonymous
  • anonymous
yea it's right
anonymous
  • anonymous
sin2x = 2sinxcosx cos2x= 2(cosx)^2 -1
anonymous
  • anonymous
\[=-2\sin x\sin(2x)+ \cos(2x)(\cos x)\]\[=-2\sin x(2\sin x \cos x)+ (2cos^2x-1)(\cos x)\]
anonymous
  • anonymous
For the first term, you'll get -4(sinx)^2 cosx (sinx)^2 = 1-(cosx)^2
anonymous
  • anonymous
Then you can express it in terms of cosx, if that's what you want.
saifoo.khan
  • saifoo.khan
Ohhh. Right. Thanks @RolyPoly and @technofable
saifoo.khan
  • saifoo.khan
idk what does that mean.. @yummydum Dubai chaltay hain. =D
anonymous
  • anonymous
Welcome..
anonymous
  • anonymous
nahi yaar bus pakistan lejao phir tum free
saifoo.khan
  • saifoo.khan
Haha. Done. Kab chalna hai? @yummydum
anonymous
  • anonymous
bus $2,000 mujhe de do baki sub khair hai, mein khud khayal kar loongi ...free biryani as a compliment ;)
saifoo.khan
  • saifoo.khan
Lmao. $2000 ki tou main zindagi bhar ki biryani kha sakta hoon. :P @yummydum
anonymous
  • anonymous
$2000 main mein pakistan jaa sakti hoon aur shopping bhi poori....us mein se agar bacha tou tumhe biryani khiladoon gi :P
saifoo.khan
  • saifoo.khan
No thank you. Tumhari tokri main hole hoga, but Allah ka shukr mairi tokri main nahi hai.
anonymous
  • anonymous
haha..chalo jao tum dubai chale jao..uri ko saath le jana :P
saifoo.khan
  • saifoo.khan
Lmao. Tum bhi chalo naa.
anonymous
  • anonymous
mein tumhari kya lagti? :P
saifoo.khan
  • saifoo.khan
Uri mairi kia lagti?
anonymous
  • anonymous
mein kya jaanoon? :P i dont go into private files
saifoo.khan
  • saifoo.khan
Hahaha. Aisa kabhi ho sakta hai k koi larki kabhi private files main na jaye?!
anonymous
  • anonymous
LMAOO
anonymous
  • anonymous
i respect private/personal space
saifoo.khan
  • saifoo.khan
Oh please. No girl is like that. I can list million of examples.
saifoo.khan
  • saifoo.khan
And since you belong to the same race, you can't be one. =D
anonymous
  • anonymous
exactly why i tell you im different...sunnay ko taiyaar nahi ho, i know, but still its true :P
anonymous
  • anonymous
to be a girl is not a race..its a species :P
saifoo.khan
  • saifoo.khan
OMG! EVERY OTHER girl EVERY OTHER says that she's not like "other girls" . Lol And you're saying the same thing!
anonymous
  • anonymous
im not "like other girls"...im just not like girls at all :P
saifoo.khan
  • saifoo.khan
Wait! You're not like girls? Then? Are you like boys? lmao.
anonymous
  • anonymous
tom boy
anonymous
  • anonymous
acha ji mujhay kaam kerna hai, kisi aur ko dhoondo yeh sab bak bak kernay k liye :P
saifoo.khan
  • saifoo.khan
Haan haan. "larkon walay" kaam karnay hongay. :P Jao bhai. Kaam karo.
anonymous
  • anonymous
if school work is "larkon walay kaam" then yes :P
saifoo.khan
  • saifoo.khan
Bhahiyon ki tarhan speed main kaam kia hai bhai apnay. Hats off.
anonymous
  • anonymous
LOL
saifoo.khan
  • saifoo.khan
Haan waisay bhi larkiyan konsa parti hain.. Unhain ultay seedhay kaamon say fursay milaygi tou parhnay ka sochainge. :P
anonymous
  • anonymous
uff itni nafrat lol :P
saifoo.khan
  • saifoo.khan
Lol. Not nafrat. Facts. Mairi konsa larkiyon say koi dushmani hai? ;D
anonymous
  • anonymous
abhi nahi hai..jab shaadi ho jaegi tou phir poochna khud say k ab kuch nafrat hai ya nahi ;P
saifoo.khan
  • saifoo.khan
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?
anonymous
  • anonymous
LOLOLOLOLOL
anonymous
  • anonymous
good to hear tum mein insaaniat hai :P
saifoo.khan
  • saifoo.khan
Alhamdulliah, achi wali hai. Tumhara husband jald suicide kar laiga. Tension na lo. :p
anonymous
  • anonymous
Kaminay!
saifoo.khan
  • saifoo.khan
Haha. Aisa usko baar baar bologi tou aur jaldi kar laiga. ;D
anonymous
  • anonymous
dont worry tumhari wali mere wale se pehli khudkushi kerlaigi :P
anonymous
  • anonymous
ye shaadi hui nahi k time for funeral :P
saifoo.khan
  • saifoo.khan
Nah. Mairay sath itni khushi hogi k usko suicide ki zaroorat he nahi paregi.
anonymous
  • anonymous
uff
saifoo.khan
  • saifoo.khan
Wait! Are you even going to get married? I doubt it.
saifoo.khan
  • saifoo.khan
MashAllah MashAllah. ;D
anonymous
  • anonymous
abhi nahi for sure :P ...ill wait till im in my 20's...kaafi time para hai :D
anonymous
  • anonymous
tumhara to lag raha hai kal shaadi hai :P
saifoo.khan
  • saifoo.khan
5~ saal tou hain. Tayyari start kardo! I wish. Ho jaye tou bohat he acha hai. ;D
anonymous
  • anonymous
why so ready to get married? :P
anonymous
  • anonymous
aur ji nahi abhi kuch 6-7 saat hein mere paas :)
saifoo.khan
  • saifoo.khan
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
anonymous
  • anonymous
no i dont know what you mean...?
saifoo.khan
  • saifoo.khan
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
anonymous
  • anonymous
LOL ...sahi
saifoo.khan
  • saifoo.khan
Ikr. Sahi like always. Ab nazar na lagao.
anonymous
  • anonymous
nazar bhoolo ab thappar pare ga :P
saifoo.khan
  • saifoo.khan
I would love to get a thappar. ;D
saifoo.khan
  • saifoo.khan
Or thappars..
anonymous
  • anonymous
kyun?
saifoo.khan
  • saifoo.khan
Why not? Thappar he tou hai.
saifoo.khan
  • saifoo.khan
But wait! Don't even dare to touch me. Mujhay koi deadly disease nahi lagwani.
anonymous
  • anonymous
zor ka parta hai, soch lo? ...khair get used to it..jo aegi wo khud bohot mare gi :P
anonymous
  • anonymous
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
saifoo.khan
  • saifoo.khan
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.
anonymous
  • anonymous
uff..chalo ro nahi :P ...i have to go..tum jao usse dhoodo ;P
saifoo.khan
  • saifoo.khan
Haha. I'm going too. Nite. :')

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