Find the residues at the given points:

a. \(\frac{2 z^{2}+3 z}{z-1}\) at \(z=1\).

b. \(\frac{\ln (1+2 z)}{z}\) at \(z=0\).

c. \(\frac{\cos z}{(2 z-\pi)^{3}}\) at \(z=\frac{\pi}{2}\).