Reduction integrals help! Watch

Idg a damn
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#1
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As per title

Someone please help me solve this question!
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The first part please guide me on deriving the expression
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Bump
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Bump bump
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This is my working anything wrong here?
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Bump
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esrever
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It seems like double reduction question. First let u = (1-x)^n, dv/dx = sin(x). Then reduce it and you will get something similar to I_n in terms of cos. Then repeat this again.

I haven't actually tried it so can't verify if it's correct.
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#11
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I figured out what I did wrong XD Thanks anyways
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