If x + iy = a+i b c+i d , prove that (x^2+y^2 )^2=a^2+b^2 c^2+d^2 - Vidyadip

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If $x + iy =\sqrt{\frac{a+i b}{c+i d}}$, prove that $\left(x^2+y^2\right)^2=\frac{a^2+b^2}{c^2+d^2}$

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