Question

How do you solve `2cosx-1=0`?

Answer 1

`x=60^@, 300^@`, for `0<=x<=360^@`

Or in radians `x=pi/3, (5pi)/3`, for `0<=x<=2pi`

Explanation:

`2cosx-1=0`
`=> cosx =1/2`
`=> x=60^@, or 300^@`