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Question Number 43324 by Raj Singh last updated on 09/Sep/18

Answered by tanmay.chaudhury50@gmail.com last updated on 09/Sep/18

(1/2)∫((x^2 +1+x^2 −1)/((x^2 −1)(x^2 +1)))dx  (1/2)∫(dx/(x^2 −1))+(1/2)∫(dx/(x^2 +1))  (1/4)∫(((x+1)−(x−1))/((x+1)(x−1)))dx+(1/2)∫(dx/(x^2 +1))  (1/4)∫(dx/(x+1))−(1/4)∫(dx/(x−1))+(1/2)∫(dx/(x^2 +1))  (1/4)ln∣((x+1)/(x−1))∣+(1/2)tan^(−1) (x)+c

$$\frac{\mathrm{1}}{\mathrm{2}}\int\frac{{x}^{\mathrm{2}} +\mathrm{1}+{x}^{\mathrm{2}} −\mathrm{1}}{\left({x}^{\mathrm{2}} −\mathrm{1}\right)\left({x}^{\mathrm{2}} +\mathrm{1}\right)}{dx} \\ $$$$\frac{\mathrm{1}}{\mathrm{2}}\int\frac{{dx}}{{x}^{\mathrm{2}} −\mathrm{1}}+\frac{\mathrm{1}}{\mathrm{2}}\int\frac{{dx}}{{x}^{\mathrm{2}} +\mathrm{1}} \\ $$$$\frac{\mathrm{1}}{\mathrm{4}}\int\frac{\left({x}+\mathrm{1}\right)−\left({x}−\mathrm{1}\right)}{\left({x}+\mathrm{1}\right)\left({x}−\mathrm{1}\right)}{dx}+\frac{\mathrm{1}}{\mathrm{2}}\int\frac{{dx}}{{x}^{\mathrm{2}} +\mathrm{1}} \\ $$$$\frac{\mathrm{1}}{\mathrm{4}}\int\frac{{dx}}{{x}+\mathrm{1}}−\frac{\mathrm{1}}{\mathrm{4}}\int\frac{{dx}}{{x}−\mathrm{1}}+\frac{\mathrm{1}}{\mathrm{2}}\int\frac{{dx}}{{x}^{\mathrm{2}} +\mathrm{1}} \\ $$$$\frac{\mathrm{1}}{\mathrm{4}}{ln}\mid\frac{{x}+\mathrm{1}}{{x}−\mathrm{1}}\mid+\frac{\mathrm{1}}{\mathrm{2}}{tan}^{−\mathrm{1}} \left({x}\right)+{c} \\ $$

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