(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

integrate this

9x³/sqrt(1+x²)

I know im suppose to substitute using: x = tan x

dx = sec²x

but thats as far as i could go. its the 9x³ that confuses me on what i should do.

thank you for your help in advance.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Integration help

**Physics Forums | Science Articles, Homework Help, Discussion**