Question

The exact value of cos 17pi/8 is

a) square root of 2+the square root of 2/4
b.) 0.38
c.) 0.99
d.)square root of 2-the sqaure root of 2/4

Answer 1

Im not sure but I think that your answer is D. The numeric value should equal 0.92.

Answer 2

if you calculate in 'degrees' rather than radians the answer is (c).

Answer 3

Actually, I take my previous answer back. Using a calculator, you get 0.375 which rounds to 0.38. So B.