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Define imaginary unit in complex numbers section #779

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Define imaginary unit in complex numbers section #779

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2 changes: 2 additions & 0 deletions lectures/complex_and_trig.md
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Expand Up @@ -45,6 +45,8 @@ So let's dive in.

A complex number has a **real part** $x$ and a purely **imaginary part** $y$.

Here, $i$ denotes the imaginary unit, satisfying $i^2 = -1$.

The Euclidean, polar, and trigonometric forms of a complex number $z$ are:

$$
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