### Home > PC > Chapter 6 > Lesson 6.2.1 > Problem6-74

6-74.

What is the range of sine and cosine?

$\text{For example, }\frac{0.3}{0.7}=\frac{3}{7}.$

$\text{Using a calculator evaluate }\tan^{-1}\left (\frac{3}{7} \right ).$

There is another solution. Use the unit circle to help you calculate the second solution.