Chapter 1 - Trigonometric Functions - Section 1.3 Trigonometric Functions - 1.3 Exercises - Page 28: 12

$\sin\theta = \frac{y}{r} = \frac{-5}{13}$ $\cos\theta = \frac{x}{r} = \frac{-12}{13}$ $\tan\theta = \frac{y}{x} = \frac{-5}{-12}$ $\csc\theta = \frac{r}{y} = \frac{13}{-5}$ $\sec\theta = \frac{r}{x} = \frac{13}{-12}$ $\cot\theta = \frac{x}{y} = \frac{-12}{-5}$

$x = -12$ $y = -5$ $r = \sqrt {(-5)^2 + (-12)^2}$ $r = \sqrt {25 + 144}$ $r = 13$