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update complexDivision in ffttools.hpp#13

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yaochx wants to merge 1 commit intojoaofaro:masterfrom
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update complexDivision in ffttools.hpp#13
yaochx wants to merge 1 commit intojoaofaro:masterfrom
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@yaochx
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@yaochx yaochx commented Sep 1, 2017

the complex division formular is
(a + b * i) / (c + d * i) = (b * c - a * d) / (c * c + d * d)

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(a + b * i) / (c + d * i) =(ac+bd)/(cc+dd)+(b * c - a * d)i / (c * c + d * d)

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