Derivative: Why Does a Tangent Give Instantaneous Slope? | JEE Lesson 73

A derivative is not just a formula. Find the average slopes of y=x² closer and closer to x=2, see a secant approach a tangent, and watch the difference quotient simplify to 4+h before the limit gives 4. Then try x=3 for yourself.

Companion to Public Math Made Clear Lesson 15.
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