1.

फलनों का समाकलन कीजिए - `(1)/(x^(2)+2x+5)`

Answer» Correct Answer - `(1)/(2)tan^(-1)((x+1)/(2))`
`int(dx)/(x^(2)+2x+5)=int(dx)/((x+1)^(2)+2^(2))=(1)/(2)tan^(-1)((x+1)/(2))+c`


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