Need Help with this Step in a DE solution

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SUMMARY

The discussion focuses on deriving the magnitude of a complex number C from equations 6.34 to 6.35 in a DE (Differential Equations) solution context. The user attempts to separate the fraction into real and imaginary parts to compute the magnitude but encounters discrepancies with the book's result. The correct approach involves recognizing that the complex norm is given by |C| = 1/√(x² + y²), confirming that the magnitude is indeed r, where r represents the distance from the origin in the complex plane.

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bigmike94
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TL;DR
There's a step in this book which i am not sure i follow
at the bottom where it says equation 6.35, the magnitude of C, how do we get from equation 6.34 to 6.35? I separated the fraction into 2, one with a real part and the other imaginary and tried taking the magnitude then and didn't come up with the same as in the book. Can someone help show me what I am missing, please?
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This is simply the complex norm: ##C=\dfrac{1}{x+iy}=\dfrac{x-iy}{(x+iy)(x-iy)}\Rightarrow |C|=\dfrac{1}{\sqrt{x^2+y^2}}=r.##
 
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