SOLUTION: In the interval 90degrees <= x <= 180degrees find the value of x that satisfies the equation 2cos^2x = 1 I started by dividing both sides by 2cos^2 which left me with X =

Question 278802: In the interval 90degrees <= x <= 180degrees find the value of x that satisfies the equation 2cos^2x = 1
I started by dividing both sides by 2cos^2 which left me with
X = 1/2cos^2 now I'm stuck
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
You can't divide by 2cos^2 because cos(x) is the function.
Do a substitution and you'll see what I mean.
Let

Now substitute back,

In the region of interest ,

Then

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