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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