In other words taking the log of a product is equal to the summing the logs of each term of the product.
The product property of logs states that ln(xy) = ln(x) + ln(y). Since ln is the natural logarithm, the usual properties of logs apply. (Regardless of the value of the constant, the derivative of ln(ax) is always 1/x)įinding the derivative of ln(2x) using log properties It’s possible to generalize the derivative of expressions in the form ln(ax) (where a is a constant value): Just be aware that not all of the forms below are mathematically correct. Using the chain rule, we find that the derivative of ln(2x) is 1/xįinally, just a note on syntax and notation: ln(2x) is sometimes written in the forms below (with the derivative as per the calculations above). (The derivative of ln(2x) with respect to 2x is (1/2x))
#HOW TO TAKE THE DERIVATIVE OF LOG HOW TO#
How to find the derivative of ln(2x) using the Chain Rule: F'(x) We will use this fact as part of the chain rule to find the derivative of ln(2x) with respect to x. In a similar way, the derivative of ln(2x) with respect to 2x is (1/2x). The derivative of ln(s) with respect to s is (1/s) The derivative of ln(x) with respect to x is (1/x) But before we do that, just a recap on the derivative of the natural logarithm. Now we can just plug f(x) and g(x) into the chain rule.
Then the derivative of F(x) is F'(x) = f’(g(x)).g’(x) We can find the derivative of ln(2x) (F'(x)) by making use of the chain rule.įor two differentiable functions f(x) and g(x) Let’s define this composite function as F(x): So if the function f(x) = ln(x) and the function g(x) = 2x, then the function ln(2x) can be written as a composite function. Let’s call the function in the argument g(x), which means: Ln(2x) is in the form of the standard natural log function ln(x), except it does not have x as an argument, instead it has another function of x (2x). Using the chain rule to find the derivative of ln(2x) To perform the differentiation, the chain rule says we must differentiate the expression as if it were just in terms of x as long as we then multiply that result by the derivative of what the expression was actually in terms of (in this case the derivative of 2x). This means the chain rule will allow us to perform the differentiation of the function ln(2x). We know how to differentiate ln(x) (the answer is 1/x).We know how to differentiate 2x (the answer is 2).The chain rule is useful for finding the derivative of an expression which could have been differentiated had it been in x, but it is in the form of another expression which could also be differentiated if it stood on its own. Finding the derivative of ln(2x) using the chain rule The second method is by using the properties of logs to write ln(2x) into a form which differentiable without needing to use the chain rule. The first method is by using the chain rule for derivatives. There are two methods that can be used for calculating the derivative of ln(2x). How to calculate the derivative of ln(2x)
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