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y = \sin^{3} x

y_{n}

এর মান কোনটি?

\frac{1}{4} [3 \sin (\frac{n π}{2} + x) - 3^{n} \sin (\frac{n π}{2} + 3 x)]

\sin (\frac{n π}{2} + x)

\cos (\frac{π}{2} + x)

3^{n} \sin (\frac{nπ}{2} + 3 x)

3^{n} \sin (\frac{nπ}{2} + 3 x) + \cos n x

ANS : 1

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