derivative of cos x

Here you will learn what is the differentiation of cosx and its proof by using first principle. Let’s begin – Differentiation of cosx The differentiation of cosx with respect to x is -sinx. i.e. \(d\over dx\) (cosx) = -sinx Proof Using First Principle : Let f(x) = cos x. Then, f(x + h) = cos(x …

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