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Z=x+iy Z=|Z|(cosα + i sinα) where |Z|=sqrt(x^2+y^2) α=arctg(y/x) To calculate the power of complex numbers, I used the de Moivre formula. Z^4+c=(|Z|^4)*(cos(4*α) + i sin(4*α))+c c=0.6+0.55i