Answer
$2$
Work Step by Step
Consider: $\lim\limits_{t \to 0}f(t)=\lim\limits_{t \to 0}\dfrac{t-\sin t}{1-\cos t}$
WenNeed to check that the limit has an indeterminate form.
Thus, $f(0)=\dfrac{0}{0}$
The limit shows an indeterminate form. Thus, apply L-Hospital's rule: $\lim\limits_{a \to b}f(x)=\lim\limits_{a \to b}\dfrac{g'(x)}{h'(x)}$
Then
$\lim\limits_{t \to 0}\dfrac{\sin t+t \cos t}{\sin t}=\dfrac{0}{0}$
WenNeed to apply L-Hospital's rule again.
$\lim\limits_{t \to 0}\dfrac{2\cos t-t \sin t}{\cos t}=\dfrac{2(1)-0}{1}=2$
