Question
If $f(x) = \begin{cases} \frac{1 - \cos Kx}{x}, & \text{if } x \neq 0 \\ \frac{\sin Kx}{1}, & \text{if } x = 0 \end{cases}$ is continuous at $x = 0$, then the value of $K$ is
If $f(x) = \begin{cases} \frac{1 - \cos Kx}{x}, & \text{if } x \neq 0 \\ \frac{\sin Kx}{1}, & \text{if } x = 0 \end{cases}$ is continuous at $x = 0$, then the value of $K$ is