tentukan hp dari persamaan teigonometri berikut: 1. Cos 2x = Cos 70 0 < x < 360. 2. Sin 2X = Sin Π/4 0 < x < 2Π. tolong bantu jwb beserta pembahasannya.

1) cos 2x = cos 70
2x = 70
x = 35
cos 2x = cos (360-70)
cos 2x = cos 310
2x = 310
x = 310/2 = 155
cos 2x = cos (360 + 70)
cos 2x = cos 430
2x = 430
x = 430/2 = 215
cos 2x = cos (360+310)
cos 2x = cos 670
2x = 670
x = 670/2 = 335
x = 35, 155, 215, 335

2) π/4 = 180/4 = 45
sin 2x = sin 45
2x = 45
x = 22,5
sin 2x = sin (180-45)
sin 2x = sin 135
2x = 135
x = 67,5
sin 2x = sin (360 + 45)
sin 2x = sin 405
2x = 405
x = 202,5
sin 2x = sin (360 + 135)
sin 2x = sin 495
2x = 495
x = 247,5
x = 22,5 ; 67,5 ; 202,5 ; 247,5