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Sajan finds the derivate of two function...

Sajan finds the derivate of two functions f(x) =`x^2` + cos x and g(x) = `x^2` cos x as follows f(x) =`x^2` + cos x , f'(x) = 2x - sin x, g (x) = `x^2` cos x , g'(x) = 2x ( - sin x)
Sajan makes a mistake in finding derivative of one of the functions. Identify that function and find out correct derivate of that function

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