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If int ((3e^x-5e^(-x)))/(4e^x+5e^(-x)))d...

If `int ((3e^x-5e^(-x)))/(4e^x+5e^(-x)))dx=ax+blog(4e^x+5e^(-x))+C`, then

A

`a=-1/8, b=7/8`

B

`a=1/8, b=7/8`

C

`a=-1/8, b=-7/8`

D

`a=1/8,b=-7/8`

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