Answer: [tex]cosN=\frac{PM}{PN}[/tex]
Step-by-step explanation:
The trigonometric function cosine uses a ratio of the opposite side from the given angle divided by the hypotenuse.
Here, that will look like this:
[tex]cosN=\frac{opposite}{hypotenuse}=\frac{PM}{PN}[/tex]
The ratio equivalent to cosN is PM divided by PN, or PM:PN.
