Question

Find the area of the shaded region:
r=sqrt(cos(2theta))
r=9cos(theta)
These are polar coordinates btw

Answer 1

You need to find the boundaries for the variables, so you can integrate.

Answer 2

In my book it somehow seperates it into two equations with different boundaries. One from o to pi/2 and one from 0 to pi/4. I can't figure it out how they got those!

Answer 3

I don't see that either.