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Further fix of "one has..." test
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@ -24,6 +24,7 @@ where r = cabs(z) is the "radius", the "modulus", the absolute value of z,
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and a = carg(z) is the "phase angle", the argument of z.
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.LP
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One has carg(z) = atan(cimag(z) / creal(z)).
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One has tan(carg(z)) = cimag(z) / creal(z).
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.SH "RETURN VALUE"
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The return value is the range of [\-pi,pi].
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.SH "CONFORMING TO"
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