1.

`int (e^(x) (1 +x))/(cos^(2)(xe^(x)))dx` का मान ज्ञात कीजिये ।

Answer» माना `I = int (e^(x) (1+x))/(cos^(2) (xe^(x)))dx`
माना ` xe^(x) = t`
`therefore" "(e^(x) + ex^(x)) dx = dt`
`rArr" "e^(x)(1+ x)dx =dt`
`therefore" " I= int(dt)/(cos^(2)t) = int sec^(2) t dt = tan t`
`therefore " " I = tan (xe^(x))`


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