Himpunan penyelesaian persamaan cos2x°-sinx°-1=0 atau 0

cos2x - sinx - 1 =0
( 1 - 2sin²x ) - sinx - 1 = 0
-2sin²x - sinx = 0
2sin²x - sinx = 0
(2sinx - 1)(sinx -0) = 0

2sinx - 1 = 0
2sinx = 1
sinx = 1/2
x = 30˚
((→Atau←))
sinx = 0
x = 0

Hp = { x = 30˚ atau x = 0 }