sin A=15/17 then cosA
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sinA=15/17
sin^2 A + cos^2 A = 1
cos^2 A = 1- sin^2 A
=1 - 225/289
=64/289
cos A = (64/289)^1/2
= 8/17
sin^2 A + cos^2 A = 1
cos^2 A = 1- sin^2 A
=1 - 225/289
=64/289
cos A = (64/289)^1/2
= 8/17
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