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Evaluate: inte^x\ ((1-sinx)/(1-cosx))\ d...

Evaluate: `inte^x\ ((1-sinx)/(1-cosx))\ dx`

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Given integral `=inte^(x)(1-2sinx/2cosx/2)/(2sin^(2)x/2)dx`
`=inte^(x)(1/2"cosec")^(2)x/2-cosx/2dx=-e^(x)cotx/2+C`
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