Question

lim
x->0 12(1-cosx)/x^2
what is the limit?

Answer 1

try multiplying top and bottom by the conjugate of 1-cosx

Answer 2

This might involve using the known limit, \(\displaystyle\lim_{x\to0}\frac{1-\cos x}{x}=0\).

Answer 3

I wasn't able to work that into it. Multiply top and bottom by 1+cosx, trig identity, then lim x->0 sinx/x is all you need