Answer
cos α = $\frac{12}{13}$ = 0.92
cos β = $\frac{5}{13}$ = 0.38
Work Step by Step
cos α = $\frac{length of adjacent}{length of hypotenuse}$
cos α = $\frac{12}{13}$ = 0.92
Similarly cos β = $\frac{length of adjacent}{length of hypotenuse}$ = $\frac{5}{13}$ = 0.38
