math

Without using a calculator, choose (a) the larger of cos 40 and cos 50; (b) the larger of sin 40 and sin 50. Be prepared to explain your reasoning.

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  1. sin(0) = 0 ... sin(90) = 1

    so ... sin(50) > sin(40)

    cos(0) = 1 ... cos(90) = 0

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