Question

How do you solve `cos 2x= sqrt2/2`?

Answer 1

`x=22.5^@`

Explanation:

`cos2x=sqrt2/2`
or
`cos2x=1/sqrt2`
or
`cos2x=cos45`
or
`2x=45`
or
`x=45/2`
or
`x=22.5^@`