SUCCESSIVE DIFFERENTIATION AND LEIBNITZ’S THEOREM
CHAPTER 1
SUCCESSIVE DIFFERENTIATION AND
LEIBNITZ'S THEOREM
1.1 Introduction
Successive Differentiation is the process of differentiating a given function successively times and the results of such differentiation are called successive derivatives. The
higher order differential coefficients are of utmost importance in scientific and engineering applications.
Let
be a differentiable function and let its successive derivatives be denoted by
.
Common notations of higher order Derivatives of
1st Derivative:
or or or or
2nd Derivative:
or or or or
Derivative:
or or or or
1.2 Calculation of nth Derivatives
i.
Derivative of
Let y =
ii.
Derivative of
Let y =
, is a
iii.
Derivative of
Let
iv.
Derivative of
Let
Similarly if
v.
Derivative of
Let
Similarly
where
Similarly if
Putting and
Function y =
y =
Summary of Results Derivative =
= = = y = y =
Example 1 Find the derivative of
Solution: Let
Resolving into partial fractions
=
=
=
=
!
Example 2 Find the Solution: Let
derivative of
= (sin10 + cos2 )
=
Example 3 Find derivative of Solution: Let y =
= = = = =
Example 4 Find the derivative of
Solution: Let
=
Example 5 Find the derivative of
Solution: Let
Now
?
?
?
Example 6 If Solution:
=
, prove that
=
=
=
=
=
and
Example 7 Find the
Solution: Let
=
derivative of =
=
= Differentiating above
= times w.r.t. x, we get
Substituting
such that
Using De Moivre's theorem, we get
where
Example 8 Find the Solution: Let
derivative of
=
where =
and =
Resolving into partial fractions
................
................
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