Question

How do you proceed to calc the limited development of `x^3/sqrt(1+x^4)` through + infinity ?

Answer 1

`infty`

Explanation:

writing
`x^3/sqrt(1+x^4)=x^3/(x^2*sqrt(1+1/x^4))`
so
`lim_(x to infty)x^3/sqrt(1+1/x^4)=infty`