- #1

EL ALEM

- 26

- 0

## Homework Statement

find all values of x in the interval [0, 2pi] that satisfy the equation 2cosx + 1 less than or equal to 0

## Homework Equations

None.

## The Attempt at a Solution

for when 2cosx+1=0

cosx=-1/2

x= 2pi/3, 4pi/3

but what about the values for when 2cosx + 1 is

*less*then 0? How to i fins those?