Trigonometryhard · Past Paper
If cos A + cos^2 A = 1, then sin^2 A + sin^4 A = ?
A0
B1
C2
D0.5
✓ Correct Answer: B — 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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