It's been ages since i did any coordinate conversions, and typically i have these two which i just can't manage to solve by myself.
I want to express the circle $x^{2}+y^{2}<4, x<0 $
The Area: $x-|y|\ge 0$
For the first problem i just thought it would be as easy as following:
$0< r < 2$
$\frac {\pi}{2}<\theta<\frac{3\pi}{2}$
For the second problem i don't even know how to begin...
Best Regards
Joe