December 2018 1 19 Report
Cos 2x = 2/3 dan -2, maka cos x =...
A. 2/3
B. -2/3
C. 1/3√6 atau -1/3√6
D. 1/6√30 atau -1/6√30
E. 2/3√2 atau -2/3√2
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