CHAPTER 4 KEY FORMULAS AND EQUATIONS

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	$\begin{array}{l} \sin θ = \frac{y}{r} & \csc θ = \frac{r}{y} \\ \cos θ = \frac{x}{r} & \sec θ = \frac{r}{x} \\ \tan θ = \frac{y}{x} & \cot θ = \frac{x}{y} \end{array}$ $\begin{array}{l} \sin θ = \frac{y}{r} & \csc θ = \frac{r}{y} \\ \cos θ = \frac{x}{r} & \sec θ = \frac{r}{x} \\ \tan θ = \frac{y}{x} & \cot θ = \frac{x}{y} \end{array}$ (4.1)
	Pythagorean theorem $c^{2} = a^{2} + b^{2}$ $c^{2} = a^{2} + b^{2}$ (4.2)
	$\begin{array}{l} \sin A = \frac{side opposite A}{hypotenuse} & \csc A = \frac{hypotenuse}{side opposite A} \\ \cos A = \frac{side adjacent A}{hypotenuse} & \sec A = \frac{hypotenuse}{side adjacent A} \\ \tan A = \frac{side opposite A}{side adjacent A} & \cot A = \frac{side adjacent A}{side opposite A} \end{array}$ $\begin{array}{l} \sin A = \frac{side opposite A}{hypotenuse} & \csc A = \frac{hypotenuse}{side opposite A} \\ \cos A = \frac{side adjacent A}{hypotenuse} & \sec A = \frac{hypotenuse}{side adjacent A} \\ \tan A = \frac{side opposite A}{side adjacent A} & \cot A = \frac{side adjacent A}{side opposite A} \end{array}$ (4.5)

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