November 2019 1 25 Report
Himpunan penyelesaian 2 cos 2xº=1 untuk 0_< x _< 360º adalah
A. 15º
B. 15º , 30º
C. 30º,150º
D. 30º,150º,210º,330º
E. 30º,150º,240º,330º

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