Derivative of ln2x

Learn how to calculate derivatives of ln(2x) with formulas. Also understand how to prove the derivative of ln2x by first principle.

Alan Walker-

Published on 2023-05-26

Introduction to the Derivative of ln2x

Derivatives have a wide range of applications in almost every field of engineering and science. The ln2x derivative can be calculated by following the rules of differentiation. Or, we can directly find the derivative ln2x by applying the first principle of differentiation. In this article, you will learn what the ln2x differentiation is and how to calculate the ln(2x) derivative by using different approaches.

What is the derivative of ln(2x)?

The derivative of ln(2x) is equal to 1 by x which is denoted by d/dx(ln(2x)). It can be found by taking the derivative of the natural logarithmic function with respect to the variable x which is equal to 1/x.

This derivative represents the rate of change of the natural logarithmic function ln 2x. It is written as;

ln(2x)=loge 2x

Where the logarithm of 2x is taken with base e. Understanding the derivative of ln 2x is essential in calculus and related fields, and can be found by differentiating ln(2x) or by using the chain rule.

Differential of ln 2x formula

The formula for the derivative of ln(2x) is equal to the reciprocal of x. It is the rate of change of the natural log ln 2x. Mathematically, the ln 2x derivative is written as;
This formula does not change for any value of constant multiplied by the variable x. For example, the differential of ln4x is also equal to 1/x. 

How do you prove the derivative of ln 2x?

There are several methods to derive the derivatives of ln(2x). Some common techniques are;

  1. First Principle
  2. Implicit Differentiation
  3. Product Rule

Each method provides a different way to compute the ln(2x) differentiation. By using these methods, we can mathematically prove the formula for finding the ln2x derivative.

Differentiation of ln2x by first principle

According to the first principle of derivative, the derivative of ln2x is equal to 1/x. The derivative of a function by first principle refers to finding a general expression for the slope of a curve by using algebra. It is also known as the delta method. The derivative is a measure of the instantaneous rate of change, which is equal to,

f(x)=lim f(x+h)-f(x) / h

This formula allows us to determine the rate of change of a function at a specific point by using limit definition of derivative. The derivative of a function can also be calculated by using the slope calculator.

Proof of ln2x differentiation by first principle

To differentiate ln2x by using first principle, we start by replacing f(x) by ln 2x.


By logarithmic properties,

f(x)=lim {ln(x+h/x)/h}


f(x)=lim {ln(1+h/x)/h}

Suppose t=h / x and h=xt. When h approaches zero, t will also approach zero.

f(x)=lim {ln(1+t)/xt}


f(x)=lim ln (1/xt) ln (1+t)

By logarithmic properties, we can write the above equation as,

f(x)=(1/x) lim ln(1+t)^1/t

Hence by limit formula, we know that,

lim ln(1+t)^1/t =ln e =1

Therefore, the differentiation of ln2x is;


Hence the derivative of ln2x is the same as ln(x) derivative.

Derivative of ln 2x using implicit differentiation

Implicit differentiation is a technique used to find the derivative of a function that is defined implicitly by an equation involving two or more variables. We can use this method to prove the differentiation of ln 2x.

Proof of derivative of ln(2x) by implicit differentiation

To differentiate ln2x, we can start by writing it as,


Converting in exponential form,

e^y = 2x

Applying derivative on both sides,


e^y.dy/dx = 2



Since x=e^y

Therefore, the dy/dx of ln2x by using implicit differentiation calculator is,


Derivative of ln 2x using product rule

Another method to calculate the differential of ln2x is the product rule which is a formula used in calculus to calculate the derivative of the product of two functions. Specifically, the product rule is used when you need to differentiate two functions that are multiplied together. The formula for the product rule calculator is:

d/dx(uv) = u(dv/dx) + (du/dx)v

In this formula, u and v are functions of x, and du/dx and dv/dx are their respective derivatives with respect to x. 

Proof of ln2x derivative by product rule

The function ln 2x can be written as;

f(x)= 1. ln(2x)

Now differentiate ln 2x with respect to x,

f(x)=(1. ln(2x))

Applying product rule,

f(x)=1.(ln(2x))+ln(2x) (0)




Hence the derivative of ln2x is always equal to the reciprocal of x.

How to find the differential of ln2x with a calculator?

The easiest way of differentiating ln2x is by using an online tool. You can use our differential calculator for this. Here, we provide you a step-by-step way to calculate derivatives by using this tool.

  1. Write the function as ln x in the enter function box. In this step, you need to provide input value as a function as you have to calculate the differentiation ln2x.
  2. Now, select the variable by which you want to differentiate ln2x. Here you have to choose x.
  3. Select how many times you want to differentiate ln 2x. In this step, you can choose 2 for 2nd derivative, 3 for third derivative and so on.
  4. Click on the calculate button.

After completing these steps, you will receive the differentiation of ln 2x within seconds. Using online tools can make it much easier and faster to calculate derivatives, especially for complex functions.

Frequently asked questions

Is ln 2x the same as 2lnx?

No, ln 2x is not the same as 2lnx. It is because in ln 2x the power of x is 1. But 2lnx can be written as ln x2. Therefore, ln 2x is not the same as ln 2x.

What is the derivative of ln(2x)?

The ln2x differentiation can be calculated as;

d/dx (ln(2x)) = 1/x

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