December 2018 1 57 Report
Jika sin a = 3/5 dengan 0<a<Π/2 dan cos b = 7/25 dengan 3Π/2<b<2Π. cot (a-b) = ..
ket a = alfa
b = beta
Π = vi
a.-117/44
b.-44/117
c.73/75
d.75/73
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