Derivative of ln4x

Learn how to prove the derivative of ln 4x logarithmic function with formula. Also understand how to prove the derivative of ln(4x) by first principle.

Alan Walker-

Published on 2023-05-26

Introduction to the derivative of ln4x

Derivatives have a wide range of applications in almost every field of engineering and science. The derivative of ln(4x) can be calculated by following the rules of differentiation.

Or, we can differentiate ln4x by applying the first principle of differentiation. In this article, you will learn what the derivative of ln4x is and how to calculate the ln(4x) derivative by using different approaches.

What is the derivative of ln(4x)?

The derivative of ln 4x with respect to the variable x is equal to 1/ x. It is denoted by d/dx [ln(4x)]. It is the rate of change of the natural logarithmic function ln(4x).

Mathematically, the function ln(4x) is written as;

ln(4x)=loge 4x

It represents the logarithm of 4x with base e. This understanding can be useful in solving related problems and understanding the behavior of logarithmic functions.

Derivative of ln4 formula

The formula for the derivative of ln(4x) is equal to the reciprocal of x. It is the rate of change of the natural log ln 4x. Mathematically, the ln 4x derivative is written as;
This formula does not change for any value of constant multiplied by the variable x. 

How do you prove the ln(4x) derivative?

There are multiple differentiation rules to derive the derivative of ln4x, and some of the commonly used methods are;

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

Each method provides a different way to compute the ln(4x) differentiation. By using these methods, we can mathematically prove the formula for finding the ln4x derivative.

Derivative of ln 4x by first principle

According to the definition of derivative calculator, the ln 4x derivative 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.

Proof of derivative of ln(4x) by first principle

To differentiate ln4x by using first principle, we start by replacing f(x) by ln 4x.


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 derivative of ln(4x) is;


ln4x derivative 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 sin inverse x. .

Proof of derivative of ln(4x) by implicit differentiation

To differentiate ln4x, we can start by writing it as,


Converting in exponential form,

ey = 4x

Applying derivative on both sides,


ey.dy/dx = 4



Since x=ey



Hence, you can also find the differential of ln4x by using our implicit derivative calculator online.

Differentiation of ln4x using product rule

The product rule 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 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. Let's calculate the differentiation of ln(4x) by using this method. 

Proof of derivative of ln(4x) by product rule

The function ln x can be written as;

f(x)= 1. ln(4x)

Applying derivative with respect to x,

f(x)=(1. ln(4x))

Applying product rule,

f(x)=1.(ln(4x))+ln(4x) (0)




Hence the derivative of ln4x is always equal to the reciprocal of x.

How to differentiate ln 4x with a calculator?

The easiest way to calculate the ln4x derivative is by using an online tool. You can use our online derivatives tool for this. Here, we provide you a step-by-step way to calculate derivatives and its functions.

  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 ln4x derivative.
  2. Now, select the variable by which you want to differentiate ln(4x). Here you have to choose x.
  3. Select how many times you want to differentiate ln(4x). In this step, you can choose 2 for second, 3 for third derivative and so on.
  4. Click on the calculate button.

After completing these steps, you will receive the differentiation of ln4x within seconds. Using online tools can make it much easier and faster to calculate derivatives, especially for complex functions.

Frequently asked questions

What is the derivative of ln4?

The derivative of ln4 is zero. It is because the derivative of a constant function is always equal to zero.

What is the derivative of ln 4x?

The derivative of ln(4x) can be calculated as;

d/dx (ln(4x)) = 1/x

What is the differentiation of a log?

The process of finding derivatives of a logarithmic function is known as differentiation of a log. It is calculated by applying natural log on both sides and computing dy/dx.

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