Question

Помогите пожалуйста.
1)1-2sin^2x+cos2x
2)1-cos2x/sin^2x
3)(1-cos2x)cig
4)cosx-sinx/cos2x-sin2x+2sin^2x

Answer 1

сos2x+cos2x=2cos2x
2sin^2 x/sin^2 x=sin^2 x