Chapter 1 - Trigonometric Functions - Section 1.3 Trigonometric Functions - 1.3 Exercises - Page 28: 19

$\sin\theta=\frac{y}{r}=\frac{2}{2}=1$ $\cos\theta=\frac{x}{r}=\frac{0}{2}=0$ $\tan\theta=\frac{y}{x}=\frac{2}{0}=undefined$ $\csc\theta=\frac{r}{y}=\frac{2}{2}=1$ $\sec\theta=\frac{r}{x}=\frac{2}{0}=undefined$ $\cot\theta=\frac{x}{y}=\frac{0}{2}=0$

$x=0$ $y=2$ $r=\sqrt{(0)^{2}+(2)^{2}}=\sqrt {0+4}= 2$