Handy Table of Trig Formulas and Identities Relationships Among Trig Functions \begin{align*} \csc x &= \frac{1}{\sin x} & \sec x &= \frac{1}{\cos x} \\ \\ \tan x &= \frac{\sin x}{\cos x} & \cot x &= \frac{\cos x}{\sin x} \end{align*} \begin{align*} \sin^2 x + \cos^2 x &= 1 \\ 1 + \cot^2 x &= \csc^2 x… [read more]
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