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Integration by Substitution

December 10, 2020 by Prasanna

Integration by Substitution

Integration by Substitution

(1) When integrand is a function i.e.,∫f[?(x)] ?'(x) dx:
Here, we put ?(x)=t, so that ?'(x) dx=dt and in that case the integrand is reduced to ∫f(t) dt.

(2) When integrand is the product of two factors such that one is the derivative of the others i.e., I = ∫f(x)f'(x) dx:
In this case we put f(x)=t and convert it into a standard integral.

(3) Integral of a function of the form f(ax + b):
Here we put ax + b = t and convert it into standard integral. Obviously if ∫f(x) dx = ?(x) then ∫f(ax + b) dx = \(\frac { 1 }{ a }\) ?(ax + b) + c.

(4) If integral of a function of the form \(\frac { f'(x) }{ f(x) }\)
Integration by Substitution 1
(5) If integral of a function of the form \({ [f(x)] }^{ n }f'(x)\)
Integration by Substitution 2
(6) If the integral of a function of the form \(\frac { f'(x) }{ \sqrt { f(x) } } \)
Integration by Substitution 3
(7) Standard substitutions
Integration by Substitution 4

Integration by Substitution Problems with Solutions

1.
Integration by Substitution 5
Solution:
Integration by Substitution 6
2.
Integration by Substitution 7
Solution:
Integration by Substitution 8
3.
Integration by Substitution 9
Solution:
Integration by Substitution 10
4.
Integration by Substitution 11
Solution:
Integration by Substitution 12
5.
Integration by Substitution 13
Solution:
Integration by Substitution 14

Filed Under: Mathematics Tagged With: Integration by Substitution

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