Derivative Of A Natural Logarithm

If f(x) = ln (x^2 + 1), what is f′(x)?

f′(x) = (2x + 1) / (x + 1)

f′(x) = 2x

f′(x) = 1 / (x^2 + 1)

f′(x) = 2x / (x^2 + 1)

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