Proof - Derivative of Cos(x) | JK Math

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How to Prove That The Derivative of Cos(x) is -Sin(x)

In this video we look at the proof for the derivative of cos(x) using the limit definition of a derivative.

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Video Chapters:
0:00 Step 1 - Limit Definition of a Derivative
0:58 Step 2 - Addition Identity for Cos(x)
1:58 Step 3 - Simplifying
5:57 Step 4 - Special Trig Limits
7:11 Step 5 - Final Solution
7:45 Outro

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