Differentiating logarithmic functions using log properties - Khan Academy
https://www.khanacademy.org/math/in-in-grade-12-ncert/xd340c21e718214c5:continuity-differentiability/xd340c21e718214c5:logarithmic-functions-differentiation/v/derivative-log-properties
webThe derivative of ln(u) is u'/u. In this case, u for ln(x + 5) is x + 5. The derivative of x + 5 is 1. Therefore you could plug in u' and u to get 1 / (x + 5). For the derivative of ln(x - 1), u would be equal to x - 1. The derivative of x - 1 is 1, so the derivative of ln(x - 1) is 1 / (x - 1). Combining these you get 1 / (x + 5) - 1 / (x - 1).
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