calculus 1 limit problem

[andy849]

determine the limit (don't use L'Hospital's Rule)



limit (1-cos(2x))/(X^2) as x->0



i'm not sure what to do? do i have to substituted 1-cos(2x) for something

 

[tkhunny]

Good guess, but not quite. Just get the cosine. \(\displaystyle \cos(2x) = 1 - 2\sin^{2}(x)\)