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.

Answer 1

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

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

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

Answer 2

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