Question

can someone help me with this intergration: sin2x

Answer 1

(sin(x))^2 by chance?

Answer 2

or sin(2x) ?

Answer 3

the second one i believe

Answer 4

do you recall what sin derives from?

Answer 5

well, cosx gives us -sinx

Answer 6

good; so -cos(2x) derives to sin(2x), almost, what happens in teh process?

Answer 7

think chain rule

Answer 8

yes, the 2x has to also get defferintiates , to 2 right

Answer 9

correct; so we need to get rid of it when it comes out

-cos(2x)
------- will take care of it
2

Answer 10

so, we will be able to compenstae fo the chain rule in all integration problems by dividing what the argument differntiates to

Answer 11

its a good rule of thumb ... and will carry you far yes

Answer 12

oka, thanks

Answer 13

do you know any website where i can get somemore practive problems of integration involving the chain rule