Trigonometrymedium · Past Paper
If sin A + sin^2 A = 1, find the value of cos^2 A + cos^4 A.
A0
B1
C2
D1/2
✓ Correct Answer: B — 1
sin A = 1 - sin^2 A = cos^2 A. Thus cos^2 A + cos^4 A = sin A + sin^2 A = 1.
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