Trigonometryhard · Past Paper
Simplify: cos^2 A + cos^2(A+120) + cos^2(A-120).
A1
B1.5
C2
D3
✓ Correct Answer: B — 1.5
Using power reduction and sum-to-product formulas, the expression simplifies to 3/2.
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✓ Correct Answer: B — 1.5
Using power reduction and sum-to-product formulas, the expression simplifies to 3/2.
Share this question