18o
36o
54o
90o
Correct answer is A
sin 3y = cos 2y, but sin θ = cos(90 - θ) sin 3y = cos(90 - 3y) cos(90 - 3y) = cos 2y 90 - 3y = 2y 5y = 90 y = 905 y = 18o
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