1.

` int _(0)^(a) sqrt(a^(2) - x^(2))` dx is equal toA. `pia^(2)`B. `1/2 pia^(2)`C. `1/3 pia^(2)`D. `1/4 pia^(2)`

Answer» Correct Answer - D
`int_(0)^(a)sqrt(a^(2)-x^(2))dx=[(x)/(2)sqrt(a^(2)-x^(2))+(a^(2))/(2)sin^(-1)((x)/(a))]_(0)^(a)`
`=[0+(a^(2))/(2)sin^(-1)(1)-0-(a^(2))/(2)sin^(-1)(0)]`
`(a^(2))/(2).(pi)/(2)-0=(a^(2)pi)/(4)`


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