If \( x+i y=\sqrt{\frac{a+i b}{c+i d}} \), prove that \( \left(x^{2}+y^{2}\right)^{2}=\frac{a^{2...
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0If \( x+i y=\sqrt{\frac{a+i b}{c+i d}} \), prove that \( \left(x^{2}+y^{2}\right)^{2}=\frac{a^{2}+b^{2}}{c^{2}+d^{2}} \).
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