ln is natural log, i.e. it has a base of e instead of 10 like log.

For differentiating you have ln(f(x)) so the derivative is f'(x)/f(x).

For integrating you want to divide by the derivative of the power. Note for 4a that isn't possible as it has lnx rather than a form of x e.g. 4x so consider indice laws. A good thing to note is that e^lnx = x and ln(e^x) as they are the inverse of each other.

NOTE: 2lnx = ln(x^2) but I'm assuming you know your log laws

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