Differentiate the following function from first principles: `logcosx`

Explanation

We have to find the derivative of `log cos x` with the first principle method, so,


`f(x)=log cos x`


by using the first principle formula, we get,


`f^{prime}(x) =lim _{h rightarrow 0} frac{f(x+h)-f(x)}{h} `

`f^{prime}(x) =lim _{h rightarrow 0} frac{log cos (x+h)-log cos x}{h} `

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