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Step 1:Derivative Of Sin X And Cos X

The two key functions of oscillation have specially neat derivatives: The slope of sin x is cos x! And the slope of cos x is - sin x. These come from one crucial fact: (sin x) / x approaches 1 at x = 0. This checks that the slope of sin x is cos 0 = 1 at the all-important point x = 0. Professor Strang connects sine and cosine to moving around a circle, or up and down for a spring, or in and out for your lungs.

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Creator:Krystal Marquez
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