(adsbygoogle = window.adsbygoogle || []).push({}); dx>0 or dx<0 ??

I've just registered in this forum and I wanted to ask my question right away.I'm 18 and I love studying Calculus.While I was studying at Derivative part of it, I've realized something at Leibniz's Notation of Derivative ([itex]\frac{dy}{dx}[/itex]).

It's equal to

lim [itex]\frac{Δy}{Δx}[/itex]=[itex]\frac{dy}{dx}[/itex]

Δx→0

My question is if we take the limit as Δx→0 (Δx→0[itex]^{+}[/itex] and Δx→0[itex]^{-}[/itex])

I think that's why dx must be both dx>0 and dx<0

Is it right??

Thanks..

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# Dx>0 or dx<0 ?

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