\( \cos ^{4} A-\sin ^{4} A \) is equal to P (a) \( 2 \cos ^{2} A+1 \) (b) \( 2 \cos ^{2} A-1 \) ...

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\( \cos ^{4} A-\sin ^{4} A \) is equal to
P
(a) \( 2 \cos ^{2} A+1 \)
(b) \( 2 \cos ^{2} A-1 \)
(c) \( 2 \sin ^{2} A-1 \)
(d) \( 2 \sin ^{2} A+1 \)
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