How to find the deriverative

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The first thing you do is take a Calculus course or at least check a Calculus text out of a library!

You will find that, for a function, f(x), the "difference quotient", that Jomo refers to, at x= a is defined as \(\displaystyle \frac{f(x+h)- f(a)}{h}\). The derivative of f(x) at x= a is the limit, as h goes to 0 of that difference quotient. Do you know anything about "limits"?
 
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How to find derivatives

You might want to look into some online resources about taking derivatives and definitions. Hope these will give you some basic idea on what it is and how you find them, and from there you can continue on the calculus journey.
 
We can locate a normal slant between two focuses. normal incline = 24/15. Yet, how would we discover the incline at a point? There is nothing to gauge! slant 0/0 = ????
 
There is NO 'incline at a point'. But the tangent to a curve, at a point, can be taken as a limit of secants to the curve on either side of that point. The slope (or incline) of the tangent is the limit of the slopes of the secants.
 
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