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Overview of Indefinite Integration

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Estimated time: 15 minutes
Maharashtra State Board: Class 12

Formula: Elementary Integration Formulae

Function Integral
\[x^{n}\] \[\frac{x^{n+1}}{n+1}+C\]
$$\int (ax + b)^n dx$$ $$\int (ax + b)^n dx$$\[\frac{x^{n+1}}{n+1}+C\]
\[\int a^xdx\] \[\frac{a^x}{\log a}+C\]
\[\int A^{ax+b}dx\] \[\frac{A^{ax+b}}{a\log A}+C\]
\[\int e^xdx\] \[e^{x}+C\]
\[\int e^{ax+b}dx\] \[\frac{e^{ax+b}}{a}+C\]
\[\int\cos xdx\] \[\sin x+C\]
\[\int\cos(ax+b)dx\] \[\frac{\sin(ax+b)}{a}+C\]
$$\int \sin x dx$$ \[-\cos x+C\]
\[\int\sin(ax+b)dx\] \[-\frac{\cos(ax+b)}{a}+C\]
\[\int\sec^2xdx\] \[\tan x+C\]
\[\int\sec^2(ax+b)dx\] \[\frac{\tan(ax+b)}{a}+C\]
$$\int \sec x \tan x dx$$ \[\sec x+C\]
\[\int\sec(ax+b)\tan(ax+b)dx\] \[\frac{\sec(ax+b)}{a}+C\]
\[\int\operatorname{cosec}x\cot xdx\] \[-\operatorname{cosec}x+C\]
\[\int\operatorname{cosec}(ax+b)\cot(ax+b)dx\] \[-\frac{\mathrm{cosec}(ax+b)}{a}+C\]
\[\int\mathrm{cosec}^2xdx\] \[-\cot x+C\]
\[\int\mathrm{cosec}^2(ax+b)dx\] \[-\frac{\cot(ax+b)}{a}+C\]
\[\int\frac{1}{x}dx\] \[\log x+C\]
\[\int\frac{1}{ax+b}dx\] \[\frac{1}{a}\log(ax+b)+C\]
Maharashtra State Board: Class 12

Formula: Integration by Substitution

If  x = φ(t) is a differentiable function of t, then \[\int f\left(x\right)\quad dx=\int f\left[\phi\left(t\right)\right]\phi^{\prime}\left(t\right)dt.\]

\[\int f\left(ax+b\right)\quad dx=g\left(ax+b\right)\frac{1}{a}+c\]
\[\int[f(x)]^n\cdot f^{\prime}(x)dx=\frac{[f(x)]^{n+1}}{n+1}+c\]
\[\int\frac{f^{\prime}(x)}{f(x)}dx=\log|f(x)|+C\]
Maharashtra State Board: Class 12

Formula: Some Special Integrals

No. Standard Integral Result
1 \[\int\frac{1}{x^2+a^2}dx\] \[\frac{1}{a}\tan^{-1}\left(\frac{x}{a}\right)+C\]
2 \[\int\frac{1}{x^2-a^2}dx\] \[\frac{1}{2a}\log\left(\frac{x-a}{x+a}\right)+c\]
3 \[\int\frac{1}{a^2-x^2}\quad dx\] \[\frac{1}{2a}\log\left(\frac{a+x}{a-x}\right)+C\]
4 \[\int\frac{1}{\sqrt{a^2-x^2}}\quad dx\] \[\sin^{-1}\left(\frac{X}{a}\right)+c\]
5 \[\int\frac{1}{\sqrt{x^2-a^2}}dx\] \[\log\left(x+\sqrt{x^{2}-a^{2}}\right)+c\]
6 \[\int\frac{1}{\sqrt{a^2+x^2}}\quad dx\] \[\log\left(x+\sqrt{a^{2}+x^{2}}\right)+c\]
7 \[\int\frac{1}{x\sqrt{x^2-a^2}}dx\] \[\frac{1}{a}\sec^{-1}\left(\frac{x}{a}\right)+c\]
Maharashtra State Board: Class 12

Formula: Standard Substitutions

Form in integral Best substitution
\[\sqrt{a^2-x^2}\] (or a cos⁡θ)
\[\sqrt{a^2+x^2}\] x = a tanθ
\[\sqrt{x^2-a^2}\] x = a secθ
\[\sqrt{\frac{a-x}{a+x}}\] x = a cos2θ
Maharashtra State Board: Class 12

Formula: Integration by Parts

\[\int u\mathrm{~}dv=uv-\int v\mathrm{~}du\]

Maharashtra State Board: Class 12

Key Points: LIATE Rule

Order Function Type
L Logarithmic
I Inverse Trigonometric
A Algebraic
T Trigonometric
E Exponential
Maharashtra State Board: Class 12

Formula: Integration by Partial Fractions

Rational Form Partial Fraction Form
\[\frac{P(x)}{(x-a)(x-b)(x-c)}\] \[\frac{A}{x-a}+\frac{B}{x-b}+\frac{C}{x-c}\]
\[\frac{P(x)}{(x-a)^2(x-b)}\] \[\frac{A}{x-a}+\frac{B}{(x-a)^2}+\frac{C}{x-b}\]
\[\frac{P(x)}{(x-a)(x^2+bx+c)}\] \[\frac{A}{x-a}+\frac{Bx+C}{x^2+bx+c}\]
\[\frac{P(x)}{(x^2+bx+c)^2}\] \[\frac{Ax+B}{x^2+bx+c}+\frac{Cx+D}{(x^2+bx+c)^2}\]
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