October 2018 1 107 Report
Diketahui sudut α dengan cos α = -1/a.jika α dikuadran II nilai sin α adalah

a.) - √a²-1 / a
b) - √a²-a / a
c) 1/√a²-1
d) √a²-1/a
e) √a²+1 / a

pake jalan yang jelas ya kk :)
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