Use the graph of the greatest integer function \( y=\lfloor x\rfloor \), Figure \( 1.10 \) in Section \( 1.1 \), to help you find the limits in Exercises 19 and 20 .
19. a. \( \lim _{\theta \rightarrow 3^{+}} \frac{\lfloor\theta\rfloor}{\theta} \)
b. \( \lim _{\theta \rightarrow 3^{-}} \frac{\lfloor\theta\rfloor}{\theta} \)
20. a. \( \lim _{t \rightarrow 4^{+}}(t-\lfloor t\rfloor) \)
b. \( \lim _{t \rightarrow 4^{-}}(t-\lfloor t\rfloor) \)
