# 9. Radians and the Trigonometric Ratios

In this section we see examples of how to use radians instead of degrees when finding the values of sin, cos, tan, csc, sec and cot of angles.

We are using all that we have learned in this chapter. If you are lost:

## Examples Involving the Trig Functions

Find the value of

1. cos(pi/6)

2. sec 4.5

3. sec 4.5^"o"

Try the following exercises.

Continues below

## Exercises

1. Find tan((4pi)/3)

2. Find sin 2.34

3. Find θ if cos θ = -0.9135 (0 ≤ θ < 2π)

4. Find θ if csc θ = 3.940\ (0 ≤ θ < 2π)

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