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intcot^4x dx cot x dx...

`intcot^4x dx` cot x dx

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`I=∫cot^4x`
`=∫cot^2x(cosec^2x−1)dx`
`=∫cot^2x×cosec^2xdx−∫cot^2xdx`
`=∫cot^2x×cosec^2xdx−∫(cosec^2x−1)dx`
...
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