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intcottheta cosec^7theta d theta...

`intcottheta cosec^7theta d theta`

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`intcottheta cosec^7theta d theta`
=`intcosec^6theta.(cosectheta.cottheta)d theta`
[Put `sectheta=t`
Then `cosectheta.cottheta d theta=dt`]
=`intt^6(-dt)=-1/7t^7+C=-1/7cosec^7theta+C`
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