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int(cot^(-1)(e^x))/e^xdx is equal to...

`int(cot^(-1)(e^x))/e^xdx` is equal to

A

`(1)/(2)ln(e^(2x)+1)-(cot^(-1)(e^(x)))/(e^(x))+x+C`

B

`(1)/(2)ln(e^(2x)+1)+(cot^(-1)(e^(x)))/(e^(x))+x+C`

C

`(1)/(2)ln(e^(2x)+1)-(cot^(-1)(e^(x)))/(e^(x))-x+C`

D

`(1)/(2)ln(e^(x)+1)-(cot^(-1)(e^(x)))/(e^(x))-x+C`

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