alleryIf sin(theta) = 3/5, then cos(theta) is (theta acute)
A4/5
B5/4
C2/5
D3/4
Answer & Solution
Correct answer: A. 4/5
cos^2 = 1 - sin^2 = 1 - 9/25 = 16/25. So cos = 4/5 (positive since acute). Classic 3-4-5 triangle.
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