Question

what is cos a? cos a = ?

Explanation:

Step1: Recall cosine formula

In a right - triangle, $\cos A=\frac{\text{adjacent}}{\text{hypotenuse}}$.

Step2: Identify adjacent and hypotenuse

For angle $A$, the adjacent side is 15 and the hypotenuse is 17.

Step3: Calculate cos A

$\cos A=\frac{15}{17}$

Answer:

$\frac{15}{17}$