`(sec^(2)x)/(sqrt(tan^(2)x+4))`

Explanation

`int(sec^(2)x)/(sqrt(tan^(2)x+4))dx" माना "tanx=t`
`=int(1)/(sqrt(t^(2)+2^(2)))dt" "rArr sec^(2)x dx = dt`
`=log|t+sqrt(t^(2)+2^(2))|+c`
`=log|tanx+sqrt(tan^(2)x+4)|+c`