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# Category: Trigonometry

## Multiple Cycles of the Complex Exponential Function

A Definite Integral of the Complex Exponential Function Recall from this post that: $ \int_0^{2 \pi} d\theta […]

## One Cycle of a Trigonometric Function

Integral of a Complex Exponential Consider the integral $ \int_0^{2 \pi} d\theta e^{i \theta} $. […]

## The Radial Unit Vector

In this post, I find an expression for the radial unit vector, $\vec{e}_r$. The three […]