Answer:
Roughly, sinC = 15/17
=> AB = 15, BC = 17 => AC = sqrt(17^2-15^2) = 8
=> cos C = AC/BC = 8/17
8/17
Step-by-step explanation:
17² = 15² + adjacent²
adjacent² = 64
adjacent = 8
Cos C = adjacent/hypotenuse
= 8/17
