Question Number 122430 by benjo_mathlover last updated on 17/Nov/20 $$\:\int\:\frac{{x}^{\mathrm{3}} }{\:\sqrt{\mathrm{4}−{x}^{\mathrm{2}} }+{x}^{\mathrm{2}} −\mathrm{4}}\:{dx}\: \\ $$ Answered by liberty last updated on 17/Nov/20 $$\:\mathrm{let}\:\sqrt{\mathrm{4}−\mathrm{x}^{\mathrm{2}} }\:=\:\omega\:\wedge\:\mathrm{x}^{\mathrm{2}} −\mathrm{4}\:=−\omega^{\mathrm{2}}…
Question Number 122397 by Ar Brandon last updated on 16/Nov/20 $$\mathrm{a}\backslash\int\frac{\mathrm{2x}+\mathrm{1}}{\mathrm{1}+\mathrm{x}}\sqrt{\frac{\mathrm{1}−\mathrm{x}}{\mathrm{1}+\mathrm{x}}}\mathrm{dx}\:\:\:\:\:\:\:\:\mathrm{c}\backslash\int\frac{\mathrm{dx}}{\:\sqrt{\mathrm{x}}+\sqrt[{\mathrm{3}}]{\mathrm{x}}} \\ $$$$\mathrm{b}\backslash\int\frac{\mathrm{dx}}{\mathrm{x}+\sqrt{\mathrm{x}−\mathrm{1}}}\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\mathrm{d}\backslash\int\frac{\mathrm{dx}}{\:\left(\mathrm{1}+\mathrm{x}\right)\sqrt{\mathrm{1}+\mathrm{x}+\mathrm{x}^{\mathrm{2}} }} \\ $$ Answered by Dwaipayan Shikari last updated on 16/Nov/20 $$\int\frac{{dx}}{{x}+\sqrt{{x}−\mathrm{1}}}…
Question Number 122366 by rs4089 last updated on 16/Nov/20 Answered by mathmax by abdo last updated on 16/Nov/20 $$\mathrm{I}\:=\int_{\mathrm{0}} ^{\infty} \:\:\:\frac{\mathrm{sin}\left(\mathrm{sinx}\right)}{\mathrm{x}}\mathrm{e}^{\mathrm{cosx}} \mathrm{dx}\:\:\mathrm{the}\:\mathrm{function}\:\mathrm{under}\:\mathrm{integral}\:\mathrm{is}\:\mathrm{even}\:\Rightarrow \\ $$$$\mathrm{2I}=\int_{−\infty} ^{+\infty}…
Question Number 56829 by maxmathsup by imad last updated on 24/Mar/19 $${let}\:{f}\left({t}\right)\:=\int_{\mathrm{0}} ^{\infty} \:\:\frac{{cos}\left({t}\left(\mathrm{1}+{x}^{\mathrm{2}} \right)\right)}{\mathrm{1}+{x}^{\mathrm{2}} }\:{dx}\:\:{with}\:{t}\geqslant\mathrm{0} \\ $$$${find}\:{a}\:{explicit}\:{form}\:{of}\:{f}\left({t}\right)\: \\ $$ Answered by Smail last updated…
Question Number 56827 by maxmathsup by imad last updated on 24/Mar/19 $${find}\:{the}\:{value}\:{of}\:\int_{−\infty} ^{+\infty} \:\:\:\frac{{dx}}{{x}^{\mathrm{4}} −{x}^{\mathrm{2}} +\mathrm{3}} \\ $$ Commented by maxmathsup by imad last updated…
Question Number 187898 by cortano12 last updated on 23/Feb/23 $$\:\:\int\:\frac{\mathrm{1}−\mathrm{cos}\:\mathrm{x}}{\mathrm{cos}\:\mathrm{x}+\mathrm{sin}\:\mathrm{x}−\mathrm{1}}\:\mathrm{dx}=? \\ $$ Answered by horsebrand11 last updated on 24/Feb/23 $$\:=\frac{\mathrm{1}}{\mathrm{2}}\int\:\frac{\mathrm{2}−\mathrm{2cos}\:{x}}{\mathrm{cos}\:{x}+\mathrm{sin}\:−\mathrm{1}}\:{dx} \\ $$$$=\frac{\mathrm{1}}{\mathrm{2}}\int\:\frac{\left(\mathrm{1}−\mathrm{cos}\:{x}+\mathrm{sin}\:{x}\right)−\left(\mathrm{cos}\:{x}+\mathrm{sin}\:{x}−\mathrm{1}\right)}{\mathrm{cos}\:{x}+\mathrm{sin}\:{x}−\mathrm{1}}\:{dx} \\ $$$$=−\frac{\mathrm{1}}{\mathrm{2}}{x}−\frac{\mathrm{1}}{\mathrm{2}}\int\frac{\mathrm{sin}\:\frac{\mathrm{1}}{\mathrm{2}}{x}+\mathrm{cos}\:\frac{\mathrm{1}}{\mathrm{2}}{x}}{\mathrm{sin}\:\frac{\mathrm{1}}{\mathrm{2}}{x}−\mathrm{cos}\:\frac{\mathrm{1}}{\mathrm{2}}{x}}\:{dx} \\…
Question Number 187890 by Rupesh123 last updated on 23/Feb/23 Answered by aleks041103 last updated on 23/Feb/23 $${I}=\underset{−\mathrm{1}} {\overset{\mathrm{1}} {\int}}\frac{\mathrm{4}\sqrt{\mathrm{1}−{x}^{\mathrm{2}} }}{\mathrm{1}+\mathrm{2}^{{x}} }{dx} \\ $$$${u}=−{x},\:{du}=−{dx} \\ $$$${I}=\int_{\mathrm{1}}…
Question Number 122349 by liberty last updated on 16/Nov/20 $$\:\mathrm{Find}\:\mathrm{the}\:\mathrm{polynomial}\:\mathrm{P}\left(\mathrm{x}\right)\:\mathrm{of}\:\mathrm{least}\:\mathrm{degree} \\ $$$$\mathrm{that}\:\mathrm{has}\:\mathrm{a}\:\mathrm{maximum}\:\mathrm{equal}\:\mathrm{to}\:\mathrm{6}\:\mathrm{at}\:\mathrm{x}=\mathrm{1} \\ $$$$\mathrm{and}\:\mathrm{minimum}\:\mathrm{equal}\:\mathrm{to}\:\mathrm{2}\:\mathrm{at}\:\mathrm{x}=\mathrm{3}.\: \\ $$ Commented by benjo_mathlover last updated on 17/Nov/20 $${my}\:{answer}\::\: \\…
Question Number 122330 by mnjuly1970 last updated on 15/Nov/20 $$\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:…{advanced}\:\:{calculus}… \\ $$$$\:\:{prove}\:{that}\:: \\ $$$$\:\:\:\mathscr{R}{e}\left(\int_{\mathrm{0}} ^{\:\frac{\pi}{\mathrm{2}}} {sin}^{\mathrm{3}} \left({x}\right){ln}\left({ln}\left({cos}\left({x}\right)\right)\right){dx}\right) \\ $$$$\:\:\:\:\:\:\:\overset{?} {=}\frac{{ln}\left(\mathrm{3}\right)−\mathrm{2}\gamma}{\mathrm{3}}\:\checkmark \\ $$ Answered by mathmax…
Question Number 122323 by mathmax by abdo last updated on 15/Nov/20 $$\mathrm{calculate}\:\:\mathrm{A}_{\mathrm{n}} =\int_{\mathrm{0}} ^{\infty} \:\:\frac{\mathrm{dx}}{\left(\mathrm{x}^{\mathrm{2}} +\mathrm{1}\right)\left(\mathrm{x}^{\mathrm{2}} +\mathrm{2}\right)….\left(\mathrm{x}^{\mathrm{2}} \:+\mathrm{n}\right)} \\ $$$$\mathrm{wth}\:\mathrm{n}\:\mathrm{integr}\:\mathrm{natural}\:\mathrm{and}\:\mathrm{n}\geqslant\mathrm{1} \\ $$ Commented by Dwaipayan…