If \( \cos A+\cos ^{2} A=1 \), then \( \sin ^{2} A+\sin ^{4} A= \)
(a) \( -1 \)
(b) 0
(c) 1
(d) ...
If \( \cos A+\cos ^{2} A=1 \), then \( \sin ^{2} A+\sin ^{4} A= \)
(a) \( -1 \)
(b) 0
(c) 1
(d) none of these
W
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