Chapter 1 - Trigonometric Functions - Section 1.3 Trigonometric Functions - 1.3 Exercises - Page 28: 20

$\sin\theta=\frac{y}{r}=\frac{5}{5}=1$ $\cos\theta=\frac{x}{r}=\frac{0}{5}=0$ $\tan\theta=\frac{y}{x}=\frac{5}{0}=undefined $ $\csc\theta=\frac{r}{y}=\frac{5}{5}=1$ $\sec\theta=\frac{r}{x}=\frac{5}{0}=undefined $ $\cot\theta=\frac{x}{y}=\frac{0}{5}=0$

$x=0$ $y=5$ $r=\sqrt{(0)^{2}+(5)^{2}}=\sqrt {0+25}= 5$