Answer:
Θ = [tex]cos^{-1}[/tex] ( [tex]\frac{y-1}{2}[/tex] )
Step-by-step explanation:
y = 2cosΘ + 1 ( subtract 1 from both sides )
y - 1 = 2cosΘ ( divide both sides by 2 )
[tex]\frac{y-1}{2}[/tex] = cosΘ , then
Θ = [tex]cos^{-1}[/tex] ( [tex]\frac{y-1}{2}[/tex] )
