Cos 2x + sin²x = 0,25

Question

Cos 2x + sin²x = 0,25

Answer 1

Cos2x+sin^2x=0,25
1-2sin^2x-1+sin^2x=0,25
-sin^2x=0,25
-sinx=0,5
sinx=-0,5
x=п/6+2пn
x=5п/5+2пn