October 2020 0 39 Report
Tentukan himpunan penyelesaian dari persamaan trigonometri berikut, untuk 0 ≤ x ≤ 360 1) 2 cos (x + 20°) + 1 = 0,
2) √2 sin x - 1 = 0
3) 2 sin x · cos x = cos x
4) cos² - x + sin x + 1 = 0

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