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Differentiate the function with respect to x: (1 + cos x)^x

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Differentiate the function with respect to x: (1 + cos x)x

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Suppose y = (1 + cos x)x

On taking log on both sides

log y = log(1 + cos x)x

log y = x log(1 + cos x){log xa = a log x}

On differentiating with respect to x 

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