1.

`int_(0)^(sqrt2) sqrt(2-x^(2)dx)` का मान ज्ञात कीजिएः।

Answer» `underset(0)overset(sqrt2)int sqrt(2-x^(2)dx)`
`underset(0)overset(sqrt2)int sqrt((sqrt2)^(2)-x^(2))dx`
`[1/2xsqrt(2-x^(2))+((sqrt2)^(2))/(2)sin^(-1) ""(x)/(sqrt2)]_(0)^(sqrt2)`
`=[sqrt2/2xx0+sin^(-1)1]-[0+0]`
`=0+pi/2=pi/2`


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