Spo�t�te $\int _{\varphi } |z| ) dz $ kde

a) $\varphi (t) =  -i + it^2 $ pro $t \in [0,2]$,

b) $\varphi (t) =  e^{it} $ pro $t \in [-\pi/2,\pi /2]$,

c) $\varphi (t) =  e^{-it}$ pro $t \in [-\pi/2,3\pi /2]$.
