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Section A.3 Trigonometry — Definitions

\begin{equation*} \begin{array}{rlcrl} \sin\theta &= \dfrac{\text{opposite}}{\text{hypotenuse}} & \qquad & \csc \theta &= \dfrac{1}{\sin\theta} \\ \cos\theta &= \dfrac{\text{adjacent}}{\text{hypotenuse}} & \qquad & \sec \theta &= \dfrac{1}{\cos\theta} \\ \tan\theta &= \dfrac{\text{opposite}}{\text{adjacent}} & \qquad & \cot \theta &= \dfrac{1}{\tan\theta} \end{array} \end{equation*}