Question

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

Answer 1

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

Answer 2

Umm. Sorry no.
I have to use the chain rule.
@RolyPoly

Answer 3

@yummydum : That won't work. :P

Answer 4

i realized that :P

Answer 5

\[\frac{d}{dx}sinxcos(2x) = cos(2x)\frac{d}{dx}sinx+sinx \frac{d}{dx}cos(2x)\]This?

Answer 6

Pretty late though. @yummydum

Answer 7

uff acha bhai mein chali jaati hoon..khush?

Answer 8

You have to use chain rule for the second term lol

Answer 9

Yes! @RolyPoly

I got till:
\[uv'+vu'\]\[\sin x(-2\sin(2x))+ \cos(2x)(\cos x)\]

Answer 10

@yummydum : RUKO! Sath chalte hain. ;)

Answer 11

kahan leja rahe ho?

Answer 12

In the second term?
is my working correct?
@RolyPoly

Answer 13

Yes, I think so..

Answer 14

Jehan aap farmaish karain. @yummydum

Answer 15

What will the step after that? I'm stuck till there. @RolyPoly

Answer 16

yea it's right

Answer 17

sin2x = 2sinxcosx
cos2x= 2(cosx)^2 -1

Answer 18

\[=-2\sin x\sin(2x)+ \cos(2x)(\cos x)\]\[=-2\sin x(2\sin x \cos x)+ (2cos^2x-1)(\cos x)\]

Answer 19

For the first term, you'll get -4(sinx)^2 cosx
(sinx)^2 = 1-(cosx)^2

Answer 20

Then you can express it in terms of cosx, if that's what you want.

Answer 21

Ohhh. Right. Thanks @RolyPoly and @technofable

Answer 22

idk what does that mean.. @yummydum
Dubai chaltay hain. =D

Answer 23

Welcome..

Answer 24

nahi yaar bus pakistan lejao phir tum free

Answer 25

Haha. Done. Kab chalna hai? @yummydum

Answer 26

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

Answer 27

Lmao. $2000 ki tou main zindagi bhar ki biryani kha sakta hoon. :P
@yummydum

Answer 28

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

Answer 29

No thank you. Tumhari tokri main hole hoga, but Allah ka shukr mairi tokri main nahi hai.

Answer 30

haha..chalo jao tum dubai chale jao..uri ko saath le jana :P

Answer 31

Lmao. Tum bhi chalo naa.

Answer 32

mein tumhari kya lagti? :P

Answer 33

Uri mairi kia lagti?

Answer 34

mein kya jaanoon? :P
i dont go into private files

Answer 35

Hahaha. Aisa kabhi ho sakta hai k koi larki kabhi private files main na jaye?!

Answer 36

LMAOO

Answer 37

i respect private/personal space

Answer 38

Oh please. No girl is like that. I can list million of examples.

Answer 39

And since you belong to the same race, you can't be one. =D

Answer 40

exactly why i tell you im different...sunnay ko taiyaar nahi ho, i know, but still its true :P

Answer 41

to be a girl is not a race..its a species :P

Answer 42

OMG! EVERY OTHER girl EVERY OTHER says that she's not like "other girls" . Lol
And you're saying the same thing!

Answer 43

im not "like other girls"...im just not like girls at all :P

Answer 44

Wait! You're not like girls? Then? Are you like boys? lmao.

Answer 45

tom boy

Answer 46

acha ji mujhay kaam kerna hai, kisi aur ko dhoondo yeh sab bak bak kernay k liye :P

Answer 47

Haan haan. "larkon walay" kaam karnay hongay. :P
Jao bhai. Kaam karo.

Answer 48

if school work is "larkon walay kaam" then yes :P

Answer 49

Bhahiyon ki tarhan speed main kaam kia hai bhai apnay. Hats off.

Answer 50

LOL

Answer 51

Haan waisay bhi larkiyan konsa parti hain..
Unhain ultay seedhay kaamon say fursay milaygi tou parhnay ka sochainge. :P

Answer 52

uff itni nafrat lol :P

Answer 53

Lol. Not nafrat. Facts.
Mairi konsa larkiyon say koi dushmani hai? ;D

Answer 54

abhi nahi hai..jab shaadi ho jaegi tou phir poochna khud say k ab kuch nafrat hai ya nahi ;P

Answer 55

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?

Answer 56

LOLOLOLOLOL

Answer 57

good to hear tum mein insaaniat hai :P

Answer 58

Alhamdulliah, achi wali hai.
Tumhara husband jald suicide kar laiga. Tension na lo. :p

Answer 59

Kaminay!

Answer 60

Haha. Aisa usko baar baar bologi tou aur jaldi kar laiga. ;D

Answer 61

dont worry tumhari wali mere wale se pehli khudkushi kerlaigi :P

Answer 62

ye shaadi hui nahi k time for funeral :P

Answer 63

Nah. Mairay sath itni khushi hogi k usko suicide ki zaroorat he nahi paregi.

Answer 64

uff

Answer 65

Wait! Are you even going to get married? I doubt it.

Answer 66

MashAllah MashAllah. ;D

Answer 67

abhi nahi for sure :P ...ill wait till im in my 20's...kaafi time para hai :D

Answer 68

tumhara to lag raha hai kal shaadi hai :P

Answer 69

5~ saal tou hain. Tayyari start kardo!

I wish. Ho jaye tou bohat he acha hai. ;D

Answer 70

why so ready to get married? :P

Answer 71

aur ji nahi abhi kuch 6-7 saat hein mere paas :)

Answer 72

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

Answer 73

no i dont know what you mean...?

Answer 74

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

Answer 75

LOL ...sahi

Answer 76

Ikr. Sahi like always. Ab nazar na lagao.

Answer 77

nazar bhoolo ab thappar pare ga :P

Answer 78

I would love to get a thappar. ;D

Answer 79

Or thappars..

Answer 80

kyun?

Answer 81

Why not? Thappar he tou hai.

Answer 82

But wait! Don't even dare to touch me. Mujhay koi deadly disease nahi lagwani.

Answer 83

zor ka parta hai, soch lo? ...khair get used to it..jo aegi wo khud bohot mare gi :P

Answer 84

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

Answer 85

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.

Answer 86

uff..chalo ro nahi :P ...i have to go..tum jao usse dhoodo ;P

Answer 87

Haha. I'm going too. Nite. :')