How do you solve #Cos^2 x - 1/2 = 0# over the interval 0 to 2pi?
1 Answer
Feb 17, 2016
Explanation:
First, take the half over to the other side to get:
We now need to find the inverse of this.
If we look at the graph of
graph{cos(x) [-0.1,6.15,-1.2,1.2]}
We should expect two answers.
So we know at least
From the symmetry of the graph the second value can be obtained by
Thus, within the region,