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intcottheta cosec^7theta d theta

Answer»

SOLUTION :`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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