4 cos^2 x - 1 = 0
cos^2 x = 1/4
cosx = ± 1/2
x = 60° , 120° , 240° , 300°
change to radians, I will let you decide how many periods (2π) have to be added to each answer for your domain
Find all solutions of 4 (cos (x)**2)-1=0 in the interval (6pi, 8pi).
(Leave your answers in exact form and enter them as a comma-separated list.)
1 answer
1 answer