What is the value of lim (x → 0) (1 - cos x) / x²?

What is the value of lim (x → 0) (1 - cos x) / x²?

Explanation

limx01cosxx2=limx0sinx2x=12lim_{x to 0} frac{1 - cos x}{x^2} = lim_{x to 0} frac{sin x}{2x} = frac{1}{2}