False
Exponents should not be simplified.
It's called a decimal.
I hope it helps.
Let's check.
x = 5π/24
4x = 5π/6
cos 4x = cos(5π/6) = cos 150° = -√3/2
cos² 4x = (-√3/2)^2 = 3/4
4 cos² 4x -3 = 4 (3/4) - 3 = 0
Answer: TRUE
M = ( (-6+4)/2, (3+-2)/2 )
M = (-1, 1/2)