Calculating Limit of Function – A quotient of functions with cos – Exercise 295

Exercise

Evaluate the following limit:

$$\lim _ { x \rightarrow 0 } \frac {1 - \cos x } {x^2}$$

$$\lim _ { x \rightarrow 0 } \frac {1 - \cos x } {x^2} = \frac {1} {2}$$