I think I found a general formula for the square root of imaginary numbers. Is this correct?

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I believe I found a formula for finding the square roots of any imaginary number. The formula is as follows: $\pm \sqrt{ai} = \pm \sqrt{\frac{a}{2}}i \pm \sqrt{\frac{a}{2}}$

and here is my proof:

$\pm \sqrt{ai} = \pm \sqrt{\frac{a}{2}}i \pm \sqrt{\frac{a}{2}} \\ \pm ai = (\pm \sqrt{\frac{a}{2}}i \pm \sqrt{\frac{a}{2}})^2 \\ \pm ai = (\pm \sqrt{\frac{a}{2}}i)^2 \pm 2\sqrt{\frac{a}{2}}\sqrt{\frac{a}{2}}i + \sqrt{\pm \frac{a}{2}}^2 \\ \pm ai = \mp \frac{a}{2} \pm 2 \times \frac{a}{2}i \pm \frac{a}{2} \\ \pm ai = \pm \frac{2a}{2}i \\ \pm ai = \pm ai$

Is this correct? if so, has it been discovered prior to my finding? I can't find it anywhere on google.