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The value of \( \left(4 \cos ^{2} 9^{\circ}-1\right)\left(4 \cos ^{...
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The value of \( \left(4 \cos ^{2} 9^{\circ}-1\right)\left(4 \cos ^{2} 27^{\circ}-1\right)\left(4 \cos ^{2} 81^{\circ}-1\right) \) \( \left(4 \cos ^{2} 243^{\circ}-1\right) \) is
(A) 1
(B) \( -1 \)
(C) 2
(D) None of these
(A) 1
(B) \( -1 \)
(C) 2
(D) None of these
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