1.

`int_(1)^(2)(dx)/(xsqrt(x^(2)-1))` का मान ज्ञात कीजिए।

Answer» `int_(1)^(2)(dx)/(xsqrt(x^(2)-1))`
`=[sec^(-1)x]_(1)^(2)=sec^(-1)2-sec^(-1)1`
`=(pi)/(3)-0=(pi)/(3)`


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