Trigonometryhard · Past Paper
If cos A + cos^2 A = 1, find the value of sin^2 A + sin^4 A.
A1
B0
C2
D1/2
✓ Correct Answer: A — 1
cos A = 1 - cos^2 A = sin^2 A. Thus sin^2 A + sin^4 A = cos A + cos^2 A = 1.
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