Question

Evaluate the angle with ordered pair (2,-3)for cosine.

Answer 1

`\theta\approx56.31^\circ`

Review attached graph and explanation

Explanation:

Since
`cos\theta=(adjacent)/(hypotenuse)`, then
`cos\theta=(2)/(√(13))\rightarrow\theta=cos^(-1)((2)/(√(13)))\approx56.31^\circ`