SOLUTION: Explain how can I get Find the value of x for: 8 Cos^2 x - 6 = 0 in degrees and radians. PLEASE

Algebra ->  Trigonometry-basics -> SOLUTION: Explain how can I get Find the value of x for: 8 Cos^2 x - 6 = 0 in degrees and radians. PLEASE       Log On


   

Question 995914: Explain how can I get Find the value of x for: 8 Cos^2 x - 6 = 0 in degrees and radians. PLEASE
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Explain how can I get Find the value of x for: 8 Cos^2 x - 6 = 0 in degrees and radians. PLEASE
----
cos^2(x) = 3/4
----
cos(x) = +-sqrt(3)/2
----
x = arccos(sqrt[+-(3)/2)] = 60 deg or 120 or 240 or 300 degrees
---------
Cheers,
Stan H.
------------