Question 197737
Find to the nearest degree, all values of x in the interval 0 
the equation 8cos^2x-2cosx - 1= 0
---------------------
Factor:
(4cos(x)+1)(2cos(x)-1) = 0
cos(x) = -1/4 or cos(x) = 1/2
x = 104.48 degrees or x = -104.48 degrees
or
x = 60 degrees or x = -60 degrees
=====================================================
Cheers,
Stan H.