If \( \sin ^{4} A-\cos ^{4} A=1 \), then \( (A / 2) \) is \( A \leq 90^{\circ} \) ). (a) \( 45^{...
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If \( \sin ^{4} A-\cos ^{4} A=1 \), then \( (A / 2) \) is \( A \leq 90^{\circ} \) ).
(a) \( 45^{\circ} \)
(b) \( 60^{\circ} \)
(c) \( 30^{\circ} \)
(d) \( 40^{\circ} \)
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