x number and returns a (magnitude, phase) pair in canonical form:
     the magnitude is nonnegative, and the phase in the range <span 
class="pcrr7t-">(-pi,</span><span 
class="pcrr7t-">&#x00A0;pi]</span>; if the magnitude is zero, then
     so is the phase.
     </dl>
<p class="noindent">
     <dl> <dt class="haddockdesc">
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