Exercise 31 Page 467

We can use a calculator to evaluate a reciprocal trigonometric ratio using the $\boxed{\text{SIN}},$ $\boxed{\text{COS}},$ and $\boxed{\text{TAN}}$ buttons. We first need to rewrite the function using its reciprocal counterpart. Be sure to always check that your calculator is in the correct mode. In this case, we need to use degrees mode. Finally, we need to round our answer to four decimal places.