Question

sinx cosx+2sin2x=cos2x

Answer 1

1/2(2sinx*cosx)+2sin2x=cos2x
1/2sin2x+2sin2x=cos2x
3/2sin2x=cos2x
1.5sin2x/cos2x=1
1.5tg2x=1
tg2x=2/3
2x=arctg2/3
x=$frac{arctg frac{2}{3} }{2}$