cosc=(a²+b²-c²)/2a*b
=(3+15-12)/2*√3*√15
=6/2*3√5=1/√5
sinc=√(5-1)/√5=2/√5=(2√5)/5
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cosc=(a²+b²-c²)/2a*b
=(3+15-12)/2*√3*√15
=6/2*3√5=1/√5
sinc=√(5-1)/√5=2/√5=(2√5)/5