1.

`int(x^9)/((4x^2+1)^6) dx` is equal toA. `(1)/(5x)(4+(1)/(x^(2)))^(-5)+C`B. `(1)/(5)(4+(1)/(x^(2)))^(-5)+C`C. `(1)/(10)(1+4x^(2))^(-5)+C`D. `(1)/(10)(4+(1)/(x^(2)))^(-5)+C`

Answer» Correct Answer - D
`I=int(x^(9)dx)/((4x^(2)+1)^(6))=int(dx)/(x^(3)(4+(1)/(x^(2)))^(6))`
`= -(1)/(2)int(d(4+(1)/(x^(2))))/((4+(1)/(x^(2)))^(6))= -(1)/(2)((4+(1)/(x^(2)))^(-5))/(-5)+C`
`=(1)/(10)(4+(1)/(x^(2)))^(-5)+C`


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