Question

How do you solve `4cos^2theta=3`?

Answer 1

`theta` = 30", 150", 210", 330"

Explanation:

4`(cos theta)^2` = 3
`(cos theta)^2`= `3/4`
`(cos theta)` = `+-(sqrt3)/2`
`theta` = 30", 150", 210", 330"

The solutions are

`S={pi/3+2pin ; 2/3pi+2pin ; 4/3pi+2pin ; 5/3pi+2pin}`, `AA n in ZZ`