# How do you use fundamental identities to find the values of the trigonometric values given angle in quadrant III, such that sec(x) = -3?

##### 1 Answer

Dec 23, 2016

#### Answer:

Please see the explanation.

#### Explanation:

Use the identity

Use the identity

Because we are given that x is in the third quadrant, we know that the sine function is negative so we remove the

Substitute

Use the identity

Use the identity

Use the identity