# 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)?

$\cos \left(\theta\right) = \frac{7}{4}$
The value of the hypotenuse can be calculated (as shown) using the Pythagorean Theorem as $\sqrt{7 + {\left(- 3\right)}^{2}} = 4$