Successive differentiation is the process in which we can differentiate the function successively multiple times and the derivative we find is called the successive derivative. Successive differentiation is very important in engineering and scientific applications.

It is the process of differentiating the given function simultaneously many times and the result obtained are called successive derivatives.

Let y = f(x) be a differentiable function.

First derivative is denoted by

Second derivative is

Third derivative is

Similarly the nth derivative is

**Successive differentiation**

The successive differential coefficients of y are denoted as follows-

The differential coefficient is-

Other notations to denote n’th differential coefficients-

The process of applying differentiation again and again is called successive differentiation.

**n**^{th}** derivative of standard functions-**

**1. n**^{th }**derivative of **** –**

Suppose y = ,

Differentiate with respect to x successively, we get

For n times differentiation, we get-

So we can say that its n’th derivative will be

**2. n**^{th }**derivative of log(ax + b)-**

Suppose y = log (ax + b)

Differentiate with respect to x successively, we get

For n times differentiation, we get-

So we can say that its n’th derivative will be

**3. n**^{th }**derivative of (ax +b)^m- **

Suppose

Differentiate with respect to x successively, we get

For n times differentiation, we get-

So we can say that its n’th derivative will be

**4. n**^{th }**derivative of sin(ax + b)-**

Suppose y = sin(ax + b)

Differentiate with respect to x successively, we get

For n times differentiation, we get-

So we can say that its n’th derivative will be

Similarly we can find the ‘n’ derivatives of such functions.

**Standard results-**

**Example: Find the nth derivative of **

Sol. Here we have-

Suppose,

First derivative-

Here

Let

So that

Which is the n’th derivative of the given function.

**Example: Find cos x cos 2x cos 3x.**

Sol:

So that-

n’th derivative-

**Example: Find the nth derivative of the following function-**

Sol. Partial fraction of the function y after splitting-

Suppose x – 1 = z, then

**Example: Find nth derivative of the given function:**

Sol. We are given-

factorize the denominator-

nth derivative will be-

Which is the derivative of the given function.

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