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f(x)=\left\{\begin{array}{ll}

x^{2}-x+1 & \text { if } x<0 \\

1-x-x^{2} & \text { if } x \geq 0

\end{array}\right. (a) Use your definition of continuity in 1(a) and the properties of limits to determine if f is continuous at a = 0. Show your work.(b) Use your definition of derivative in 1(b) and the properties of limits to determine if f has a derivative at a = 0. Show your work.

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