Question

como resolver ( 1 + i ) elevado a menos 4 = 0,92385

Answer 1

$(1+i)^{-4}=(\frac{1}{1+i})^4=(\frac{1}{1+i})^2\cdot(\frac{1}{1+i})^2=(\frac{1}{1+2i+i^2})(\frac{1}{1+2i+i^2})=(\frac{1}{2i})(\frac{1}{2i})$ $=\frac{1}{4i^2}=-\frac{1}{4}$