Derivative of Cos(x) Proof (Using the Limit Definition)

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Proof that the derivative of cos(x) is -sin(x), using the limit definition of the derivative.
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Proof that the derivative of cos(x) is -sin(x), using the limit definition of the derivative. Enjoy!

(Proof that sin(x)/x as x approaches 0 =1 and (cos(x)-1)/x as x approaches 0 = 0 coming soon.)

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clean and simple xplanation. upload more !!

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