Trigonometrymedium · Past Paper
If sin theta = 3/5, what is the value of cos theta?
A4/5
B5/3
C3/4
D4/3
✓ Correct Answer: A — 4/5
Using sin^2 + cos^2 = 1: cos^2 = 1 - (3/5)^2 = 1 - 9/25 = 16/25. Thus cos = 4/5.
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