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Cosine is the function of an angle (trigonometric function)

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## Derivative

For the cosine function: <MATH> f(x) = \cos x </MATH> The derivative is the sine: <MATH> f'(x) = \sin x </MATH>

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Cosine is the function of an angle (trigonometric function)

For the cosine function: <MATH> f(x) = \cos x </MATH> The derivative is the sine: <MATH> f'(x) = \sin x </MATH>