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Differentiate (cosx)^x with respect to x...

Differentiate `(cosx)^x` with respect to `x` :

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$$ y=(\cos x)^{x} $$ By Taking log on Both Side

`\log y=x \log \cos x` $$ \frac{1}{y} \frac{d y}{d x}=\log \cos x-x \tan x ...
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