February 2019 2 42 Report
Himpunan penyelesaian persamaan trigonometri 2 cos (2x - 60°) = 1 untuk 0° x 180° adalah
A. 45°,135°
B. 60°,165°
C. 60°,180°
D. 60°,180°
E. 135°,180°

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