Answer:

Step-by-step explanation:
Refer the attached figure
Hypotenuse = AC = 17 cm
An acute angle of the triangle is labeled as x degrees.i.e.∠ACB = x
The side adjacent to the acute angle has length 15 centimeters i.e. BC = 15 cm
The side opposite to the acute angle has length 8 centimeters.i.e. AB = 8 cm
Now we will use trigonometric ratio


So, 
Hence the value of cos x° is 