Question

HP dari cos 2x+sinx-1=0 0<×<360

Answer 1

Cos 2x=1-2 sin^2 x

cos 2x+sin x-1 = 0 (0(1-2 sin^2 x) + sin x - 1 = 0
1 - 1 -2 sin^2 x + sin x = 0
-2 sin^2 x + sin x = 0
2 sin^2 x - sin x = 0
sin x (2 sin x - 1) = 0


1)... sin x =0 -> x=0,180
2)... sin x =1/2 -> x=30,150

HP={0,30,150,180}