Answer to Question #7291 in Complex Analysis for yvonne
x = 3>0, y = 12>0;
r = sqrt(x²+y²) = sqrt(3²+12²) = sqrt(153)
α = arctan(12/3) = arctan(4)
... = r(cosα + isinα) = r(cosα + isinα) = sqrt(153)*(cos(arctan(4)) + i*sin(arctan(4))).
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