Chapter 1 - Review Exercises - Page 42: 37

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

$x= -1; y=0$ $r=\sqrt {(x)^{2}+(y)^{2}}= \sqrt {(-1)^{2}+(0)^{2}}=\sqrt {1}=1$