Evaluate intsin2xd(cotx)....

Evaluate `intsin2xd(cotx)`.

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`I=intsin2xd(tanx)`
`=intsin2x*(d (tan x))/(dx)dx`
`=int sin2x sec^(2)x dx`
`=2int tanxdx`
`=2 " In " |sec x| +c`

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