$$\Large \text{Hello. Does }\;\;\;\sin^22x \quad \text{changes into other trigonometric identities ?}$$

Which is the first step I need to take here... (see picture.)

http://i1064.photobucket.com/albums/u368/Kreshnik-joker/INTEGRAL-3.jpg

Question

$$\Large \text{Hello.   Does    }\;\;\;\sin^22x \quad \text{changes into other trigonometric identities ?}$$

Which is the first step I need to take here... (see picture.)

http://i1064.photobucket.com/albums/u368/Kreshnik-joker/INTEGRAL-3.jpg

anonymous · Answer

$1 - \cos^2 2x$?

anonymous · Answer

Oh, convert it into cosec (I didn't see the picture at first)

callisto · Answer

$$\int\limits 1/\sin^22x dx = \int\limits \csc^22x dx $$
It should be easier to do

anonymous · Answer

$$\int \csc^2 2x = -\frac{1}{2} \cot^2 2x$$

anonymous · Answer

Maybe, I am not sure

anonymous · Answer

thank you everyone. :)

anonymous · Answer

I have the tendency to forget identities and standard rules. :/

callisto · Answer

$$\int\limits \csc^22xdx = -1/2 (\cot2x) +C$$

anonymous · Answer

Forgot the Constant :/

callisto · Answer

$$d(cotx) /dx = -csc^2x$$