| Table of Definite Integrals | |
|---|---|
| Definition of Definite Integral | |
| $ \int_{a}^{b} f ( x ) d x = \lim_{n \to \infty} { f ( a ) \Delta x + f ( a + \Delta x ) \Delta x + f ( a + 2 \Delta x ) + \cdot \cdot \cdot + f ( a + ( n - 1 ) \Delta x ) \Delta x } $ | |
| $ \int_{a}^{b} f ( x ) d x = \int_{a}^{b} \frac{d}{dx} g ( x ) d x = g ( x ) |_{a}^{b} = g ( b ) - g ( a ) $ | |
| $ \int_{a}^{\infty} d x = \lim_{n \to \infty} \int\limits_{a}^{b} f ( x ) d x $ | |
| $ \int_{-\infty}^{\infty} f ( x ) d x = \lim_{a \to - \infty \ b \to \infty} \int\limits_{a}^{b} f ( x ) d x $ | |
| $ \int_{a}^{b} f ( x ) d x = \lim_{\epsilon \to \infty} \int\limits_{a}^{b - \epsilon} f ( x ) d x $ | |
| $ \int_{a}^{b} f ( x ) d x = \lim_{\epsilon \to \infty} \int\limits_{a + \epsilon}^{b} f ( x ) d x $ | |
| General Rules for Definite Integral | |
| $ \int\limits_{a}^{b} { f ( x ) \pm g ( x ) \pm h ( x ) \pm \cdot \cdot \cdot } d x = \int\limits_{a}^{b} f ( x ) d x \pm \int\limits_{a}^{b} g ( x ) d x \pm \int\limits_{a}^{b} h ( x ) d x \pm \cdot \cdot \cdot $ | |
| $ \int_{a}^{b} c f ( x ) d x = c \int_{a}^{b} f ( x ) d x $ | |
| $ \int_{a}^{a} f ( x ) d x = 0 $ | |
| $ \int_{a}^{b} f ( x ) d x = - \int_{b}^{a} f ( x ) d x $ | |
| $ \int_{a}^{b} f ( x ) d x = \int_{a}^{c} f ( x ) d x + \int_{c}^{b} f ( x ) d x $ | |
| $ \int_{a}^{b} f ( x ) d x = ( b - a ) f ( c ) \qquad c \ is \ a \ number \ between \ a \ and \ b \ as \ long \ as \ f ( x ) \ is \ continous \ between \ a \ and \ b $ | |
| $ \int_{a}^{b} f ( x ) g ( x ) d x = f ( c ) \int\limits_{a}^{b} g ( x ) d x \qquad c \ is \ a \ number \ between \ a \ and \ b \ as \ long \ as \ f ( x ) \ is \ continous \ between \ a \ and \ b $ | |
| $ \ and \ g ( x ) \ge 0 $ | |
| Leibnitz rule for derivation | |
| $ \frac{d}{d \alpha} \int_{\Phi_1 ( \alpha )}^{\Phi_2 ( \alpha ) } F ( x , \alpha ) d x = \int_{\Phi_1 ( \alpha )}^{\Phi_2 ( \alpha ) } \frac{\partial F}{\partial \alpha} d x + F ( \Phi_2 , \alpha ) \frac{d \Phi_1}{d \alpha} - F ( \Phi_1 , \alpha ) \frac{d \Phi_2}{d \alpha} $ | |
| Definite Integral containing rational and irrational expressions | |
| $ \int_{a}^{\infty} \frac {d x}{x^2 + a^2} = \frac{\pi}{2a} $ | |
| $ \int_{0}^{\infty} \frac{x^{p-1} d x}{1 + x} = \frac{\pi}{\sin p \pi} \qquad 0 \ < \ p < \ 1 $ | |
| $ \int_{0}^{\infty} \frac{x^m d x}{x^n + a^n} = \frac{\pi a^{m+1-n}}{n \sin [ \frac{( m + 1 ) \pi}{n} ] } \qquad 0 \ < \ m+1 \ < \ n $ | |
| $ \int_{0}^{\infty} \frac{x^m d x}{1 + 2 x \cos \beta + x^2} = \frac{\pi}{\sin m \pi} \frac{\sin m \beta}{\sin \beta} $ | |
