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निम्नलिखित फलनों से `(dy)/(dx)` ज्ञात कीजिए - `y=sinx.sin2x.sin4x.sin8x`

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निम्नलिखित फलनों से `(dy)/(dx)` ज्ञात कीजिए -
`y=sinx.sin2x.sin4x.sin8x`
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`sinx. Sin2x sin 4x. Sin 8x[cot x+2 cot 2x+4 cot 4x+8 cot 8x]`
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