Question Number 92344 by 675480065 last updated on 06/May/20 | ||
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$$\int_{\mathrm{0}} ^{\mathrm{1}} \frac{\mathrm{dx}}{\sqrt{\mathrm{1}+\mathrm{3x}}−\sqrt{\mathrm{1}−\mathrm{3x}}} \\ $$ | ||
Commented byjohn santu last updated on 06/May/20 | ||
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$$\underset{\mathrm{0}} {\overset{\mathrm{1}} {\int}}\:\frac{\sqrt{\mathrm{1}+\mathrm{3}{x}}\:+\:\sqrt{\mathrm{1}−\mathrm{3}{x}}}{\mathrm{6}{x}}\:\:{dx}\: \\ $$ $${I}_{\mathrm{1}} \:=\:\underset{\mathrm{0}} {\overset{\mathrm{1}} {\int}}\:\frac{\sqrt{\mathrm{1}+\mathrm{3}{x}}}{\mathrm{6}{x}}\:{dx} \\ $$ $${I}_{\mathrm{2}} \:=\:\underset{\mathrm{0}} {\overset{\mathrm{1}} {\int}}\:\frac{\sqrt{\mathrm{1}−\mathrm{3}{x}}}{\mathrm{6}{x}}\:{dx}\: \\ $$ | ||
Commented by675480065 last updated on 06/May/20 | ||
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$$\mathrm{thnks}\:\mathrm{sir}\: \\ $$ $$\mathrm{i}\:\mathrm{cant}\:\mathrm{continue} \\ $$ | ||
Commented bymathmax by abdo last updated on 06/May/20 | ||
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$${this}\:{integral}\:{is}\:{divergent}\:\:\:\sqrt{\mathrm{1}+\mathrm{3}{x}}\sim\mathrm{1}+\frac{\mathrm{3}{x}}{\mathrm{2}}\:\:{and}\:\sqrt{\mathrm{1}−\mathrm{3}{x}}\sim\mathrm{1}−\frac{\mathrm{3}{x}}{\mathrm{2}} \\ $$ $$\Rightarrow\sqrt{\mathrm{1}+\mathrm{3}{x}}−\sqrt{\mathrm{1}−\mathrm{3}{x}}\sim\mathrm{3}{x}\:\Rightarrow\frac{\mathrm{1}}{\sqrt{\mathrm{1}+\mathrm{3}{x}}−\sqrt{\mathrm{1}−\mathrm{3}{x}}}\:\sim\frac{\mathrm{1}}{\mathrm{3}{x}}\:{but} \\ $$ $$\int_{\mathrm{0}} ^{\mathrm{1}} \:\frac{{dx}}{\mathrm{3}{x}}\:\:\:{is}\:{divergent}...! \\ $$ | ||