What are the values of the trigonometric functions in the given expressions?

A) Cos(45) = 1/√2, cos(90) = 0, Cos(45) = 1/√2
B) Cos(45) = 0, cos(90) = 1/√2, Cos(45) = 1/√2
C) Cos(45) = 1/2, cos(90) = 0, Cos(45) = 1/2
D) Cos(45) = 1/√2, cos(90) = 1/√2, Cos(45) = 1/√2