1.

d /dx (log ( sqrt(x+ sqrt( x^(2) + a^(2) ))))=

Answer»

`SQRT(X^(2) + a^(2) )`
`1/sqrt(x^(2) + a^(2) )`
`1/(2sqrt(x^(2) + a^(2)) )`
`1/(2(x+sqrt(x^(2) + a^(2)) ))`

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