Trigonometrymedium · Past Paper
If tan A = 3/4, find the value of cos(2A).
A7/25
B24/25
C1/7
D7/24
✓ Correct Answer: A — 7/25
cos(2A) = (1 - tan^2 A) / (1 + tan^2 A) = (1 - 9/16) / (1 + 9/16) = 7/25.
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✓ Correct Answer: A — 7/25
cos(2A) = (1 - tan^2 A) / (1 + tan^2 A) = (1 - 9/16) / (1 + 9/16) = 7/25.
Share this question