Question Number 67015 by mathmax by abdo last updated on 21/Aug/19 $${let}\:{f}\left({x}\right)\:={arctan}\left(\mathrm{1}+{e}^{−\sqrt{\mathrm{1}+{x}^{\mathrm{2}} }} \right) \\ $$$${calculate}\:{f}^{'} \left({x}\right)\:\:{and}\:{f}^{''} \left({x}\right). \\ $$$$\left.\mathrm{1}\right){find}\:{lim}_{{x}\rightarrow+\infty} {f}\left({x}\right)\:{and}\:{lim}_{{x}\rightarrow−\infty} \:\:\:{f}\left({x}\right) \\ $$$$\left.\mathrm{3}\right){study}\:{the}\:{variation}\:{of}\:{f}\left({x}\right) \\…
Question Number 132551 by liberty last updated on 15/Feb/21 $$\mathrm{A}\:\mathrm{conservative}\:\mathrm{design}\:\mathrm{team}\:,\:\mathrm{call}\:\mathrm{it}\:\mathrm{C} \\ $$$$\mathrm{and}\:\mathrm{innovative}\:\mathrm{design}\:\mathrm{team}\:\mathrm{call} \\ $$$$\mathrm{it}\:\mathrm{N}\:,\:\mathrm{are}\:\mathrm{asked}\:\mathrm{to}\:\mathrm{separately}\:\mathrm{design} \\ $$$$\mathrm{a}\:\mathrm{new}\:\mathrm{product}\:\mathrm{within}\:\mathrm{a}\:\mathrm{month}. \\ $$$$\mathrm{From}\:\mathrm{past}\:\mathrm{experience}\:\mathrm{we}\:\mathrm{know}\:\mathrm{that} \\ $$$$\left(\mathrm{a}\right)\:\mathrm{The}\:\mathrm{probability}\:\mathrm{that}\:\mathrm{team}\:\mathrm{C}\:\mathrm{is}\:\mathrm{successful}\:\mathrm{is}\:\mathrm{2}/\mathrm{3} \\ $$$$\left(\mathrm{b}\right)\:\mathrm{The}\:\mathrm{probability}\:\mathrm{that}\:\mathrm{team}\:\mathrm{N}\:\mathrm{is}\:\mathrm{successful}\:\mathrm{1}/\mathrm{2} \\ $$$$\left(\mathrm{c}\right)\:\mathrm{The}\:\mathrm{probability}\:\mathrm{that}\:\mathrm{at}\:\mathrm{least}\:\mathrm{one} \\…
Question Number 67012 by mathmax by abdo last updated on 21/Aug/19 $${find}\:\int_{\mathrm{1}} ^{+\infty} \:\frac{{arctan}\left(\left[{x}\right]\right)}{{x}^{\mathrm{3}} }{dx} \\ $$ Commented by mathmax by abdo last updated on…
Question Number 132550 by liberty last updated on 15/Feb/21 $$\mathrm{If}\:{a}=\mathrm{1}\:\mathrm{then}\:\underset{{x}\rightarrow\left({a}^{\mathrm{2}} −\mathrm{3}{x}+\mathrm{5}\right)} {\mathrm{lim}}\frac{−\mathrm{4}{x}^{\mathrm{2}} +\sqrt{\mathrm{3}{x}+\mathrm{1}}}{\:\sqrt{{x}^{\mathrm{2}} +\mathrm{8}{x}}+\mathrm{2}}\:=? \\ $$$$\left(\mathrm{a}\right)\:−\mathrm{1}\:\:\:\:\:\:\:\left(\mathrm{b}\right)\:−\frac{\mathrm{4}}{\mathrm{5}}\:\:\:\:\:\:\:\left(\mathrm{c}\right)\:−\frac{\mathrm{3}}{\mathrm{5}} \\ $$$$\left(\mathrm{d}\right)\:−\frac{\mathrm{2}}{\mathrm{5}}\:\:\:\:\left(\mathrm{e}\right)\:−\frac{\mathrm{1}}{\mathrm{5}} \\ $$ Commented by MJS_new last updated…
Question Number 67013 by mathmax by abdo last updated on 21/Aug/19 $${find}\:{the}\:{value}\:{of}\:\sum_{{n}=\mathrm{1}} ^{\infty} \:\:\:\frac{\left(−\mathrm{1}\right)^{{n}} }{\left({n}+\mathrm{1}\right){n}^{\mathrm{3}} } \\ $$ Commented by mathmax by abdo last updated…
Question Number 67010 by mathmax by abdo last updated on 21/Aug/19 $${calculate}\:\:\sum_{{n}=\mathrm{4}} ^{+\infty} \:\:\:\:\frac{{n}}{\left({n}^{\mathrm{2}} −\mathrm{9}\right)^{\mathrm{2}} } \\ $$ Commented by mathmax by abdo last updated…
Question Number 67011 by mathmax by abdo last updated on 21/Aug/19 $${calculate}\:{U}_{{n}} =\int_{\mathrm{1}} ^{+\infty} \:\:\frac{{arctan}\left({n}\left[{x}\right]\right)}{{x}^{\mathrm{2}} }{dx} \\ $$ Commented by mathmax by abdo last updated…
Question Number 67008 by mathmax by abdo last updated on 21/Aug/19 $${let}\:{f}\left({x}\right)\:=\int_{\mathrm{0}} ^{\infty} \:\:\:\:\frac{{dt}}{\left({x}^{\mathrm{2}} \:+{t}^{\mathrm{2}} \right)^{\mathrm{2}} }\:\:{with}\:{x}>\mathrm{0} \\ $$$$\left.\mathrm{1}\right)\:{find}\:{a}\:{explicit}\:{form}\:{of}\:\left({x}\right) \\ $$$$\left.\mathrm{2}\right){find}\:{also}\:{g}\left({x}\right)\:=\int_{\mathrm{0}} ^{\infty} \:\:\:\frac{{dt}}{\left({x}^{\mathrm{2}} \:+{t}^{\mathrm{2}} \right)^{\mathrm{3}}…
Question Number 1472 by 123456 last updated on 11/Aug/15 $$\mathrm{find}\:{f}:\left[\mathrm{0},\mathrm{1}\right]\rightarrow\mathbb{R}\:\mathrm{such}\:\mathrm{that} \\ $$$${a}.\underset{\mathrm{0}} {\overset{\mathrm{1}} {\int}}{fdt}=\underset{\mathrm{0}} {\overset{\mathrm{1}} {\int}}\sqrt{\mathrm{1}+\left(\frac{{df}}{{dt}}\right)^{\mathrm{2}} }{dt} \\ $$$${b}.\forall{x}\in\left[\mathrm{0},\mathrm{1}\right] \\ $$$$\underset{\mathrm{0}} {\overset{{x}} {\int}}{fdt}=\underset{\mathrm{0}} {\overset{{x}} {\int}}\sqrt{\mathrm{1}+\left(\frac{{df}}{{dt}}\right)^{\mathrm{2}}…
Question Number 67006 by mathmax by abdo last updated on 21/Aug/19 $${calculae}\:{A}_{{n}} =\int_{\mathrm{0}} ^{\infty} \:\:\:\:\frac{{dx}}{\left({x}^{\mathrm{2}} +\mathrm{1}\right)^{{n}} }\:\:\:{with}\:{n}\:{integr}\:{natural}\:{and}\:{n}>\mathrm{0} \\ $$ Commented by mathmax by abdo last…