HP DARI
COS 2X° = SIN 2X° ,0 ≤ × ≤ 180
COS 2X° = SIN 2X° ,0 ≤ × ≤ 180
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cos 2x = cos (90 - 2x)
2x = 90 - 2x
4x = 90 + k.360
x = 22,5 + k.90
k = 0 → x = 22,5°
k = 1 → x = 22,5 + 90 = 112,5°
Hp = {22,5° , 112,5°}