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17-22 Explain why the function is discontinuous at the given number a. Sketch the graph of the function. \text { 18. } f(x)=\left\{\begin{array}{ll} \frac{1}{x+2} & \text { if } x
\neq-2 \\ 1 & \text { if } x=-2 \end{array}\right. a=-2
Fig: 1
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