A song to help math students memorize to fundamental definitions in calculus: the formal definition of a derivative and the formal definition of a derivative at a point!

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A primer on the Zoroastrian religion. Discussions of Zarathustra, Ahura Mazda and the Avesta. Missed the previous lesson? Watch here: https://www.khanacademy.org/humanities/world-history/ancient-medieval/ancient-persia/v/cyrus-the-great-establishes-the-achaemenid-empire World History on Khan Academy: From the earliest civilizations to the modern world, geography, religion, trade, and politics have bound peoples and nations together — and torn them apart. Take a journey through time…

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In this video, I cover how to solve exponential and logarithmic equations.

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