The symmetric derivative of abs(x) at x=0,

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related rates, heating up a circular metal plate,
Related rates example, this problem is taken from Single Variable Calculus, by James Stewart, 8th Ed, early transcendental,
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Practice#2, https://youtu.be/A45rzfoqveE ,
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related rates, water rising in an inverted circular cone,
Related rates example, this problem is taken from Single Variable Calculus, by James Stewart, 8th Ed, early transcendental,
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related rates, two cars approaching to the same intersection Related rates example, this problem is taken from Single Variable Calculus, by James Stewart, 8t...

Graphing f(x)=x^2-x-ln(x),

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In this video, I calculate the half-derivative of 1, using the formula for the half-derivative. Warning: The answer is not 0. Enjoy!

What is the radius of the circle, in simplest terms involving a, b, and c? I read that even the great mind Richard Feynman made a mistake. Watch the video to learn the common mistake and what the correct answer is.

Source Feynman story
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