1.

Evaluate: `inte^x ((sin4x-4)/(1-cos4x)) dx`

Answer» Correct Answer - `e^(x)cot2x+C`
`I=inte^(x){(2sin2xcos2x)/(2sin^(2)2x)-(4)/(2sin^(2)2x)}dx=inte^(x){cot2x-2"cosec"^(2)2x}dx=e^(x)cot2x+C`.


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