1.

int (dx)/(x^(2) sqrt(4 + x^(2)))=

Answer»

`(1)/(4) sqrt(4 + X^(2)) + C `
`(-1)/(4) sqrt(4 + x^(2)) + c `
`(-1)/(4x) sqrt(4 + x^(2)) + c `
`(9)/(4x) sqrt(4 + x^(2)) + c `

ANSWER :C


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