What is the value of cosθ given that (−2, −3) is a point on the terminal side of θ ?
* 2√13 / √13
* −2√13 / √13
* 3√13 / √13
* −3√13 / √13
cos θ = x / r
r = √ [ (-2)^2 + (-3)^2 ] = √ [ 4 + 9 ] = √13
So
cos θ = -2/√13 = -2 √13 / 13
