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Continuity

Discuss the continuity of the function f(x)={x|x|x,x02,x=0 at x=0


When x>0,|x|=+x

When x<0,|x|=x

lim

\lim\limits_{x \to 0^-}f\left(x\right)=\lim\limits_{x \to 0} \; \dfrac{x+x}{x}=\dfrac{2x}{x}=2

f\left(0\right)=2

Since \lim\limits_{x \to 0^-}f\left(x\right)=f\left(0\right) \neq \lim\limits_{x \to 0^+}f\left(x\right), function f\left(x\right) is discontinuous at x=0.