What is an infinitesimal? A friendly overview for you!

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Infinitesimals are handy numbers for doing some tricky things! In this video we cover:
1. what they are (and how they are defined, mathematically);
2. why they are useful; and
3. how to use them!

For #3, we'll use infinitesimals to calculate the area of a circle, woo!

Questions about this or other math topics? Leave a comment and let's tackle it together :)
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