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Properties of Definite Integrals

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Estimated time: 5 minutes
Maharashtra State Board: Class 12

Key Points: Properties of Definite Integrals

(i)\[\int_{a}^{b}\mathrm{f}\left(x\right)\mathrm{d}x=\int_{a}^{b}\mathrm{f}\left(t\right)\mathrm{d}t\]

(ii)\[\int_{\mathrm{a}}^{\mathrm{b}}\mathrm{f}\left(x\right)\mathrm{d}x=-\int_{\mathrm{b}}^{\mathrm{a}}\mathrm{f}\left(x\right)\mathrm{d}x\]

(iii)\[\int_{a}^{b}f\left(x\right)\mathrm{d}x=\int_{a}^{c}f\left(x\right)\mathrm{d}x+\int_{c}^{b}f\left(x\right)\mathrm{d}x,a<c<b\]

(iv)\[\int_{0}^{a}\mathrm{f}\left(x\right)\mathrm{d}x=\int_{0}^{a}\mathrm{f}\left(\mathrm{a}-x\right)\mathrm{d}x\]

(v)\[\int_{\mathrm{a}}^{\mathrm{b}}\mathrm{f}\left(x\right)\mathrm{d}x=\int_{\mathrm{a}}^{\mathrm{b}}\mathrm{f}\left(\mathrm{a}+\mathrm{b}-x\right)\mathrm{d}x\]

(vi)\[\int_{0}^{2a}\mathrm{f}\left(x\right)\mathrm{d}x=\int_{0}^{a}\left[\mathrm{f}\left(x\right)+\mathrm{f}\left(2\mathrm{a}-x\right)\right]\mathrm{d}x\]

(vii)\[\int_{0}^{2a}\mathrm{f}\left(x\right)\mathrm{d}x=2\int_{0}^{a}\mathrm{f}\left(x\right)\mathrm{d}x,\] if f(2a − x) = f(x)
                        = 0,                      if f(2a − x) = −f(x)

(viii)$$\int_{-a}^{a} f(x) dx = \begin{cases} 2 \int_{0}^{a} f(x) dx, & \text{if } f(x) \text{ is an even function} \\ & \text{i.e., } f(-x) = f(x) \\ 0, & \text{if } f(x) \text{ is an odd function} \\ & \text{i.e., } f(-x) = -f(x) \end{cases}$$

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