HI i was doing some integration and come across to this.

a^4 sin^2(x) cosx cosx = a^4/ 4 (sin^2 (2x))??

Question

HI i was doing some integration and come across to this. 

a^4 sin^2(x) cosx cosx = a^4/ 4 (sin^2 (2x))??

anonymous · Answer

$$a ^{4}\times \sin ^{2}x \cos x \cos x = a ^{4}\div4\times \sin ^{2}2x$$

anonymous · Answer

i dono how u convert and get this, please help me, tomorrow there is exam

anonymous · Answer

are you integrating with respect to $a$ ?

anonymous · Answer

no, this has nothing to do with integration yet, this is simplying the equation to integrate it, but i don understand how they get the end answer

anonymous · Answer

because u can integrate the right hand side, just by changing sin^2x to 1/2 - 1/2 cosx, but i don understand how they get the sin^2x from the left hand side

anonymous · Answer

nvm solved (: