Let \( P_{n}(u) \) be a polynomial is \( u \) of degree \( n \). Th...

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Let \( P_{n}(u) \) be a polynomial is \( u \) of degree \( n \). Then, for every positive integer \( n, \sin 2 n x \) is expressible is
\( \mathrm{P} \)
(a) \( P_{2 n}(\sin x) \)
(b) \( P_{2 n}(\cos x) \)
W
(c) \( \cos x P_{2 n-1}(\sin x) \)
(d) \( \sin x P_{2 n-1}(\cos x) \)
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