Trigonometryhard · Past Paper
Find the value of sqrt(2 + sqrt(2 + 2 cos 4A)).
A2 cos A
Bcos A
C2 sin A
Dsin 2A
✓ Correct Answer: A — 2 cos A
Using 1 + cos 2theta = 2 cos^2 theta repeatedly simplifies the expression to 2 cos A.
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✓ Correct Answer: A — 2 cos A
Using 1 + cos 2theta = 2 cos^2 theta repeatedly simplifies the expression to 2 cos A.
Share this question