Introduced in order to fix the idea of velocity:

See: Zeno’s paradoxes

Working example:

Which is exactly .

### Enjoy your derivatives

and

And for the die-hard:

You can check them using mathematica or sage (sage is free).

### Useful Links

Mathematica for students http://www.wolfram.com/mathematica/how-to-buy/education/students.html

Wolfram:Alpha http://www.wolframalpha.com

Khan Academy http://www.khanacademy.org

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