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int0^pisqrt((1-x)/(1+x))dx= (pi^)/2 (b)...

`int_0^pisqrt((1-x)/(1+x))dx=` `(pi^)/2` (b) `(pi^)/2-1` (c) `(pi^)/2+1` (d) `pi+1`

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BANSAL-INTEGRALS-All Questions
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