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Category: Limits

n-1-1-n-n-

Question Number 145951 by ArielVyny last updated on 09/Jul/21 $$\underset{{n}\geqslant\mathrm{1}} {\sum}\frac{\left(−\mathrm{1}\right)^{{n}} }{{n}}=?? \\ $$ Answered by Olaf_Thorendsen last updated on 09/Jul/21 $$\frac{\mathrm{1}}{\mathrm{1}+{x}}\:=\:\mathrm{1}−{x}+{x}^{\mathrm{2}} −{x}^{\mathrm{3}} +…\:=\:\underset{{n}=\mathrm{0}} {\overset{\infty}…

lim-x-0-ln-tan-x-1-sin-x-xsin-x-

Question Number 80343 by jagoll last updated on 02/Feb/20 $$\underset{{x}\rightarrow\mathrm{0}} {\mathrm{lim}}\:\frac{{ln}\left(\mathrm{tan}\:{x}+\mathrm{1}\right)−\mathrm{sin}\:{x}}{{x}\mathrm{sin}\:{x}} \\ $$ Commented by abdomathmax last updated on 02/Feb/20 $${we}\:{have}\:{ln}^{'} \left(\mathrm{1}+{u}\right)=\frac{\mathrm{1}}{\mathrm{1}+{u}}=\mathrm{1}−{u}\:+{o}\left({u}^{\mathrm{2}} \right)\left({u}\sim\mathrm{0}\right) \\ $$$$\Rightarrow{ln}\left(\mathrm{1}+{u}\right)={u}−\frac{{u}^{\mathrm{2}}…

lim-x-x-tan-1-x-1-x-4-pi-4-

Question Number 145806 by bramlexs22 last updated on 08/Jul/21 $$\:\underset{{x}\rightarrow\infty} {\mathrm{lim}}\:\mathrm{x}\left(\mathrm{tan}^{−\mathrm{1}} \left(\frac{\mathrm{x}+\mathrm{1}}{\mathrm{x}+\mathrm{4}}\right)−\frac{\pi}{\mathrm{4}}\right)\:=?\: \\ $$ Answered by gsk2684 last updated on 08/Jul/21 $$\underset{{x}\rightarrow\infty} {\mathrm{lim}}{x}\left(\mathrm{tan}^{−\mathrm{1}} \left(\frac{\frac{{x}+\mathrm{1}}{{x}+\mathrm{4}}−\mathrm{1}}{\mathrm{1}+\frac{{x}+\mathrm{1}}{{x}+\mathrm{4}}}\right)\right) \\…

Question-80220

Question Number 80220 by TawaTawa last updated on 01/Feb/20 Commented by kaivan.ahmadi last updated on 01/Feb/20 $$\forall\epsilon>\mathrm{0}\exists\delta>\mathrm{0}\:{s}.{t}\:\mid{x}−\mathrm{3}\mid<\delta\Rightarrow\mid{x}^{\mathrm{2}} −\mathrm{9}\mid<\epsilon \\ $$$$\mid{x}^{\mathrm{2}} −\mathrm{9}\mid=\mid{x}−\mathrm{3}\mid\mid{x}+\mathrm{3}\mid<\epsilon \\ $$$${if}\:\delta=\mathrm{1}\Rightarrow\mid{x}−\mathrm{3}\mid<\mathrm{1}\Rightarrow−\mathrm{1}<{x}−\mathrm{3}<\mathrm{1}\Rightarrow\mathrm{2}<{x}<\mathrm{4}\Rightarrow \\ $$$$\mathrm{5}<{x}+\mathrm{3}<\mathrm{7}\Rightarrow\mid{x}+\mathrm{3}\mid<\mathrm{7}…

lim-x-1-xe-x-

Question Number 80064 by Rio Michael last updated on 30/Jan/20 $$\underset{{x}\rightarrow−\infty} {\mathrm{lim}}\:\left[\sqrt{\mathrm{1}−{xe}^{{x}} \:}\right] \\ $$ Commented by mathmax by abdo last updated on 30/Jan/20 $${no}\:{its}\:{a}\:{indeterminedform}\:\:{its}\:{not}\:{correct}…