If sin θ = 3/5, then cos θ (acute angle):
A2/5
B3/5
C4/5CORRECT
D5/3
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Why the answer is C, and why the others tempt you.
sin² + cos² = 1 → cos²θ = 1 − 9/25 = 16/25 → cos θ = 4/5.
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