Show that where z denotes the principal branch L 2 dz = 1+e=" 2 -(1 - i), 2 = exp(i Log 2) (2> 0, < Arg z Suggestion: Use an antiderivative of the branch of the same power function. 3 < arg z < 2 = exp(i log 2) (12 > 0, -/ < |2|