Trigonometrymedium · Past Paper
If sin A = 1/sqrt(2), find cos(2A).
A1
B0
C1/2
D-1
✓ Correct Answer: B — 0
cos(2A) = 1 - 2 sin^2 A = 1 - 2(1/2) = 0.
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✓ Correct Answer: B — 0
cos(2A) = 1 - 2 sin^2 A = 1 - 2(1/2) = 0.
Share this question