Question 401042
Solve equation for all value of ø if ø measure in degrees
34)4cos^2ø-4cosø+1 = 0

4cos^2ø-4cosø+1 = 0
change theta to x for this format
4cos^2x-4cosx+1=0
to solve, treat this like a quadratic equation
let cosx=u
4u^2-4u+1=0
factor
(2u-1)(2u-1)=0
2u-1=0
u=1/2
cosx=u=1/2
x=+-60deg+-360kdeg, k being an integer