1.

`int(x^(3))/(1+x^(8))` का मान ज्ञात कीजिए ।

Answer» माना `I=int(x^(3))/(1+x^(8))dx`
माना `" "x^(4)=t`
`rArr" "4x^(3)dx=dt`
`rArr" "x^(3)dx=(dt)/(4)`
`therefore" "I=int(dt)/(4(1+t^(2)))=(1)/(4)tan^(-1)t+c`
`" "=(1)/(4)tan^(-1)x^(4)+c`


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