∫ (x^2)/ [square root (x^2 +20)] dx
this is another problem assigned in my homework and im just really confused on what to do.. on how to use both.. help appreciated!
The integral becomes
which, switching to sine and cosine, becomes
Since that has an odd power of cosine, I would suggest multiplying both numerator and denominator by , and then letting so that .
a rational integral that can by done by "partial fractions".