Question

Solve:cos^2A/2-cosA/2+1/4=0(0°<=A<=180)​

Answer 1

Step-by-step explanation:

Let cos A/2 be x

x^2-x+1/4=0

x^2-x=-1/4 (add 1/2^2 on both sides)

we get ,

(x-1/2)^2= 0

x-1/2=0

x=1/2