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show that int (1)/((x^(2) + a^(2))^(3)) ...

show that `int (1)/((x^(2) + a^(2))^(3)) `dx
`= (1)/(4a^(2)) (x)/((x^(2) + a^(2))^(2)) + (3)/(8a^(4)) (x)/(x^(2) + a^(2)) + (3)/(8a^(5)) tan^(-1) ((x)/(a)) ` + c

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