Written Homework $1-$ Due

Find the following limits using a graph. Sketch the write DNE and explain why.

$($a$)\underset{x{0}^{+}}{lim}arctan(\frac{1}{x})=\underset{y}{lim}arctany=$

$($b$)\underset{h{3}^{-}}{lim}\frac{sin(h)}{h}=-73$ for $h$

$\underset{n{3}^{-}}{lim}\frac{sin(3)}{3}=\frac{sin(*3)}{3}=$

from the $1,$

positive $\underset{t-1^{-}}{lim}-2t+1$

Please help me GRAPH this question for all $3$ parts $($a$,$b$,$c$).$ Thank you