October 2018 2 71 Report
Jika A+B= 1/6π dan cosAcosB = 3/4, maka cos(A-B) = ..
a.  \frac{1}{9} + \frac{ \sqrt{3} }{2}
b.  \frac{3}{2} + \frac{ \sqrt{3} }{2}
c.  \frac{3}{4} - \frac{ \sqrt{3} }{2}
d.  \frac{3}{2} - \frac{ \sqrt{3} }{2}
e.  \frac{ \sqrt{3} }{2}

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