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1.sin(x-y)/sin(x-z) = m/n cos(x-y)/cos(x-z) = u/v prove that cos(y-z) = um+vn/un+vm

1.sin(x-y)/sin(x-z) = m/n       cos(x-y)/cos(x-z) = u/v prove that cos(y-z) = um+vn/un+vm

Grade:12

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