These are the most obtuse physics I have ever seen.

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Derivative of sin x and cos x Instructor: Gilbert Strang http://ocw.mit.edu/highlights-of-calculus 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 =…

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