# No cheating. Derivative tests not allowed!

Calculus Level pending

The given function is not continuous. You have to find it's left hand derivative WITHOUT using any derivative test at $$x=1$$.

$$f(x)= \dfrac{[x]}{|x|}$$ where $$x$$ is not equal to $$0$$. $$[x]$$ and $$|x|$$ are the greatest integer and moduli functions respectively.

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