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dengan 90 ≤ x ≤ 180 berarti x berada pada kuadran II (x = (-), y = (+))
sin 90 - x = cos x
sin x = y / r
y = 15
r = 17
r² = x² + y²
x² = r² - y²
x² = 289 - 225
x² = 64
x = lebihkurang 8 , x < 0 sehingga x= -8
selanjutnya gunain tuh rumus sin 90-x = cos x