Formula:KLS:01.16:06

{\displaystyle{\displaystyle{\displaystyle\delta x=x+\textstyle\frac{1}{2}% \mathrm{i}-(x-\textstyle\frac{1}{2}\mathrm{i})=\mathrm{i}\quad\textrm{and}% \quad\delta x^{2}=(x+\textstyle\frac{1}{2}\mathrm{i})^{2}-(x-\textstyle\frac{1% }{2}\mathrm{i})^{2}=2\mathrm{i}x}}}

Proof

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