ada yang bisa bantu matematika kelas 11 nomer 1

=[cos A cos B - sin A sin B] / [sin a cos B]
=[cos A cos B] / [sin A cos B] - [sin A sin B]/[sin A cos B]
=[cos A / sin A] - [sin B / cos B]
= cot A - tan B


=cos x [1 - (1-2sin^2 x)]
=cos x (2 sin x sin x)
= [2 cos x sin x] sin x
= sin x sin2x