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int x^(3)sqrt((1+x^(2))/(1-x^(2)))dx=A s...

` int x^(3)sqrt((1+x^(2))/(1-x^(2)))dx=A sqrt(1-x^(4))-Bx^(2)sqrt(1-x^(4))+C sin^(-1)sqrt(1-x^4)+D` then A+B+C is equal to
`(A) (-1)/(2) (B) (-1)/(4) (C) (1)/(4) (D) (1)/(2) `

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