What is cos 45°? A. (1)/(√(2)) B. 1 C. (1)/(5) D. √(2)

Question

What is cos 45°?

A.
`(1)/(√(2))`
B. 1
C.
`(1)/(5)`
D.
`√(2)`

Answer 1

cos is (adjacent)/(hypotenuse)

cos = 1/√2

A (however typically we would rationalize the denominator)