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Evaluate the following integrals: (1-...

Evaluate the following integrals: (1-35) `int_(-a)^a log((a-sintheta)/(a+sintheta)) d theta ,a >0`

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I=`int_(-a)^a log((a-sintheta)/(a+sintheta)) d theta`
`f(-theta)= log((a+sintheta)/(a-sintheta)) d theta`
`f(-theta)=( log((a-sintheta)/(a+sintheta)))^(-1) d theta`
`f(-theta)=-f(theta)`
...
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