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@@ 2,7 +2,7 @@ A complex number can be represented as a pair of real numbers (cartesian coordin 
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$$z = x + iy$$ or in polar coordinates $$ z = r\,e^{i\, \phi}$$. The phase $$\phi$$ is defined up to a multiple of $$2\,\pi$$ 
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The computation of the polar coordinates is set as a problem in the list of examples. 
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https://miau.mumie.net/webmiau/editor/content%2Fexamples%2FinputFunction%2Fprb_input_function_polarrepresentation_complexnumber.src.tex 

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+[examples](https://miau.mumie.net/webmiau/editor/content%2Fexamples%2FinputFunction%2Fprb_input_function_polarrepresentation_complexnumber.src.tex) 
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The computation of the phase $$\phi$$ requires some care: 
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$$ \phi = \arctan(y/x), \mod 2\pi, \text{for}\, x > 0 $$ 
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