Question

Cos (1/2 x) = 3/4?

Answer 1

`x = +- 82^@82 + k720^@`

Explanation:

`cos (x/2) = 3/4 = 0.75`
Calculator and unit circle -->
`x/2 = +- 41^@41 + k360^@`
`x = +- 82^@82 + k720^@`