Question

integerate 3x^2/(1+x^6) dx

Answer 1

did you try substituting, x^3 = u
???

du = ... ?

x^6 = u^2

Answer 2

du=3x^2

Answer 3

du = 3x^2 dx

Answer 4

therefore dx=du/3x^2

Answer 5

go on, ask if you get stuck

Answer 6

\[\int\limits (1+u^2)^-1 du\]

Answer 7

yeah, integral 1/(1+u^2) dx

thats the standard integral, do you know what this equals ?

Answer 8

i mean du **