tentukan himpunan penyelesaian. √2 cos x = 1 0˚ < X < 360˚

cos x = 1/2 akar 2
cos x = cos 45°

x = 45 + k.360
k = 0, x = 45°

x = -45 + k.360
k = 1, x= 315°

HP = {45°, 315°}