saifoo.khan
Differentiate: sin(x)*cos(2x)
Delete
Share
This Question is Closed
RolyPoly
Best Response
You've already chosen the best response.
1
\[\frac{d}{dx}sinxcos(2x) = \frac{d}{dx}sinx(1-2sin^2x)\]Does that help?
saifoo.khan
Best Response
You've already chosen the best response.
0
Umm. Sorry no.
I have to use the chain rule.
@RolyPoly
saifoo.khan
Best Response
You've already chosen the best response.
0
@yummydum : That won't work. :P
yummydum
Best Response
You've already chosen the best response.
0
i realized that :P
RolyPoly
Best Response
You've already chosen the best response.
1
\[\frac{d}{dx}sinxcos(2x) = cos(2x)\frac{d}{dx}sinx+sinx \frac{d}{dx}cos(2x)\]This?
saifoo.khan
Best Response
You've already chosen the best response.
0
Pretty late though. @yummydum
yummydum
Best Response
You've already chosen the best response.
0
uff acha bhai mein chali jaati hoon..khush?
RolyPoly
Best Response
You've already chosen the best response.
1
You have to use chain rule for the second term lol
saifoo.khan
Best Response
You've already chosen the best response.
0
Yes! @RolyPoly
I got till:
\[uv'+vu'\]\[\sin x(-2\sin(2x))+ \cos(2x)(\cos x)\]
saifoo.khan
Best Response
You've already chosen the best response.
0
@yummydum : RUKO! Sath chalte hain. ;)
yummydum
Best Response
You've already chosen the best response.
0
kahan leja rahe ho?
saifoo.khan
Best Response
You've already chosen the best response.
0
In the second term?
is my working correct?
@RolyPoly
RolyPoly
Best Response
You've already chosen the best response.
1
Yes, I think so..
saifoo.khan
Best Response
You've already chosen the best response.
0
Jehan aap farmaish karain. @yummydum
saifoo.khan
Best Response
You've already chosen the best response.
0
What will the step after that? I'm stuck till there. @RolyPoly
technofable
Best Response
You've already chosen the best response.
0
yea it's right
RolyPoly
Best Response
You've already chosen the best response.
1
sin2x = 2sinxcosx
cos2x= 2(cosx)^2 -1
RolyPoly
Best Response
You've already chosen the best response.
1
\[=-2\sin x\sin(2x)+ \cos(2x)(\cos x)\]\[=-2\sin x(2\sin x \cos x)+ (2cos^2x-1)(\cos x)\]
RolyPoly
Best Response
You've already chosen the best response.
1
For the first term, you'll get -4(sinx)^2 cosx
(sinx)^2 = 1-(cosx)^2
RolyPoly
Best Response
You've already chosen the best response.
1
Then you can express it in terms of cosx, if that's what you want.
saifoo.khan
Best Response
You've already chosen the best response.
0
Ohhh. Right. Thanks @RolyPoly and @technofable
saifoo.khan
Best Response
You've already chosen the best response.
0
idk what does that mean.. @yummydum
Dubai chaltay hain. =D
RolyPoly
Best Response
You've already chosen the best response.
1
Welcome..
yummydum
Best Response
You've already chosen the best response.
0
nahi yaar bus pakistan lejao phir tum free
saifoo.khan
Best Response
You've already chosen the best response.
0
Haha. Done. Kab chalna hai? @yummydum
yummydum
Best Response
You've already chosen the best response.
0
bus $2,000 mujhe de do baki sub khair hai, mein khud khayal kar loongi ...free biryani as a compliment ;)
saifoo.khan
Best Response
You've already chosen the best response.
0
Lmao. $2000 ki tou main zindagi bhar ki biryani kha sakta hoon. :P
@yummydum
yummydum
Best Response
You've already chosen the best response.
0
$2000 main mein pakistan jaa sakti hoon aur shopping bhi poori....us mein se agar bacha tou tumhe biryani khiladoon gi :P
saifoo.khan
Best Response
You've already chosen the best response.
0
No thank you. Tumhari tokri main hole hoga, but Allah ka shukr mairi tokri main nahi hai.
yummydum
Best Response
You've already chosen the best response.
0
haha..chalo jao tum dubai chale jao..uri ko saath le jana :P
saifoo.khan
Best Response
You've already chosen the best response.
0
Lmao. Tum bhi chalo naa.
yummydum
Best Response
You've already chosen the best response.
0
mein tumhari kya lagti? :P
saifoo.khan
Best Response
You've already chosen the best response.
0
Uri mairi kia lagti?
yummydum
Best Response
You've already chosen the best response.
0
mein kya jaanoon? :P
i dont go into private files
saifoo.khan
Best Response
You've already chosen the best response.
0
Hahaha. Aisa kabhi ho sakta hai k koi larki kabhi private files main na jaye?!
yummydum
Best Response
You've already chosen the best response.
0
LMAOO
yummydum
Best Response
You've already chosen the best response.
0
i respect private/personal space
saifoo.khan
Best Response
You've already chosen the best response.
0
Oh please. No girl is like that. I can list million of examples.
saifoo.khan
Best Response
You've already chosen the best response.
0
And since you belong to the same race, you can't be one. =D
yummydum
Best Response
You've already chosen the best response.
0
exactly why i tell you im different...sunnay ko taiyaar nahi ho, i know, but still its true :P
yummydum
Best Response
You've already chosen the best response.
0
to be a girl is not a race..its a species :P
saifoo.khan
Best Response
You've already chosen the best response.
0
OMG! EVERY OTHER girl EVERY OTHER says that she's not like "other girls" . Lol
And you're saying the same thing!
yummydum
Best Response
You've already chosen the best response.
0
im not "like other girls"...im just not like girls at all :P
saifoo.khan
Best Response
You've already chosen the best response.
0
Wait! You're not like girls? Then? Are you like boys? lmao.
yummydum
Best Response
You've already chosen the best response.
0
tom boy
yummydum
Best Response
You've already chosen the best response.
0
acha ji mujhay kaam kerna hai, kisi aur ko dhoondo yeh sab bak bak kernay k liye :P
saifoo.khan
Best Response
You've already chosen the best response.
0
Haan haan. "larkon walay" kaam karnay hongay. :P
Jao bhai. Kaam karo.
yummydum
Best Response
You've already chosen the best response.
0
if school work is "larkon walay kaam" then yes :P
saifoo.khan
Best Response
You've already chosen the best response.
0
Bhahiyon ki tarhan speed main kaam kia hai bhai apnay. Hats off.
yummydum
Best Response
You've already chosen the best response.
0
LOL
saifoo.khan
Best Response
You've already chosen the best response.
0
Haan waisay bhi larkiyan konsa parti hain..
Unhain ultay seedhay kaamon say fursay milaygi tou parhnay ka sochainge. :P
yummydum
Best Response
You've already chosen the best response.
0
uff itni nafrat lol :P
saifoo.khan
Best Response
You've already chosen the best response.
0
Lol. Not nafrat. Facts.
Mairi konsa larkiyon say koi dushmani hai? ;D
yummydum
Best Response
You've already chosen the best response.
0
abhi nahi hai..jab shaadi ho jaegi tou phir poochna khud say k ab kuch nafrat hai ya nahi ;P
saifoo.khan
Best Response
You've already chosen the best response.
0
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?
yummydum
Best Response
You've already chosen the best response.
0
LOLOLOLOLOL
yummydum
Best Response
You've already chosen the best response.
0
good to hear tum mein insaaniat hai :P
saifoo.khan
Best Response
You've already chosen the best response.
0
Alhamdulliah, achi wali hai.
Tumhara husband jald suicide kar laiga. Tension na lo. :p
yummydum
Best Response
You've already chosen the best response.
0
Kaminay!
saifoo.khan
Best Response
You've already chosen the best response.
0
Haha. Aisa usko baar baar bologi tou aur jaldi kar laiga. ;D
yummydum
Best Response
You've already chosen the best response.
0
dont worry tumhari wali mere wale se pehli khudkushi kerlaigi :P
yummydum
Best Response
You've already chosen the best response.
0
ye shaadi hui nahi k time for funeral :P
saifoo.khan
Best Response
You've already chosen the best response.
0
Nah. Mairay sath itni khushi hogi k usko suicide ki zaroorat he nahi paregi.
yummydum
Best Response
You've already chosen the best response.
0
uff
saifoo.khan
Best Response
You've already chosen the best response.
0
Wait! Are you even going to get married? I doubt it.
saifoo.khan
Best Response
You've already chosen the best response.
0
MashAllah MashAllah. ;D
yummydum
Best Response
You've already chosen the best response.
0
abhi nahi for sure :P ...ill wait till im in my 20's...kaafi time para hai :D
yummydum
Best Response
You've already chosen the best response.
0
tumhara to lag raha hai kal shaadi hai :P
saifoo.khan
Best Response
You've already chosen the best response.
0
5~ saal tou hain. Tayyari start kardo!
I wish. Ho jaye tou bohat he acha hai. ;D
yummydum
Best Response
You've already chosen the best response.
0
why so ready to get married? :P
yummydum
Best Response
You've already chosen the best response.
0
aur ji nahi abhi kuch 6-7 saat hein mere paas :)
saifoo.khan
Best Response
You've already chosen the best response.
0
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
yummydum
Best Response
You've already chosen the best response.
0
no i dont know what you mean...?
saifoo.khan
Best Response
You've already chosen the best response.
0
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
yummydum
Best Response
You've already chosen the best response.
0
LOL ...sahi
saifoo.khan
Best Response
You've already chosen the best response.
0
Ikr. Sahi like always. Ab nazar na lagao.
yummydum
Best Response
You've already chosen the best response.
0
nazar bhoolo ab thappar pare ga :P
saifoo.khan
Best Response
You've already chosen the best response.
0
I would love to get a thappar. ;D
saifoo.khan
Best Response
You've already chosen the best response.
0
Or thappars..
yummydum
Best Response
You've already chosen the best response.
0
kyun?
saifoo.khan
Best Response
You've already chosen the best response.
0
Why not? Thappar he tou hai.
saifoo.khan
Best Response
You've already chosen the best response.
0
But wait! Don't even dare to touch me. Mujhay koi deadly disease nahi lagwani.
yummydum
Best Response
You've already chosen the best response.
0
zor ka parta hai, soch lo? ...khair get used to it..jo aegi wo khud bohot mare gi :P
yummydum
Best Response
You've already chosen the best response.
0
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
Best Response
You've already chosen the best response.
0
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.
yummydum
Best Response
You've already chosen the best response.
0
uff..chalo ro nahi :P ...i have to go..tum jao usse dhoodo ;P
saifoo.khan
Best Response
You've already chosen the best response.
0
Haha. I'm going too. Nite. :')