In: Advanced Math
. Use the Taylor expansion of the function f(z) = 1 1+z [8] 4 centred at the origin z = 0, together with the extended Cauchy Integral Formula to evaluate the contour integrals I C dz/ z^ k (z^ 4 + 1), k = 0, 1, . . . , where C is any positively oriented simple contour going around the origin that is interior to the circle of radius 1 centred at z = 0.
ANSWER
Cauchy-Goursat Theorem. If a function f is analytic at all points interior to and on a simple closed contour C (i.e., f is analytic on some simply connected domain D containing C), then ∫C f(z) dz = 0. ... However, the Cauchy-Goursat theorem says we don't need to assume that f is continuous (only that it exists!)