sin(-2x)=cos(1/2x) berapa hp nya?

sin -2x = cos (1/2)x
sin -2x = sin (90 -1/2x)
-2x = 90 -1/2x
-2x + 1/2 x = 90
-3/2x = 90
-3/2x = 90 + k.360
x = -60 - k.240 ( k = -1)...
x = 180 . semoga membantu....!