# Math Help - Determine the exact value of (trig function) given...

1. ## Determine the exact value of (trig function) given...

A coordinate plane, and a coordinate. An example is: Coordinate (-3, -5) in quadrant 3?

2. Originally Posted by Incursion
A coordinate plane, and a coordinate. An example is: Coordinate (-3, -5) in quadrant 3?
$x = r\cos{\theta}$ and $y = r\sin{\theta}$

where $r = \sqrt{x^2 + y^2}$.