# If #theta# is an angle in standard position on a rectangular coordinate system and the point P(sqrt 7,-3) lies on its terminal side, find do you find the exact value of #cos(theta)#?

##### 1 Answer

Jun 16, 2015

#### Explanation:

(See diagram)

The value of the hypotenuse can be calculated (as shown) using the Pythagorean Theorem as

The cosine is (by definition) the adjacent side divided by the hypotenuse.