Question Number 9969 by Tawakalitu ayo mi last updated on 20/Jan/17 $$\mathrm{Calculate}\:\mathrm{the}\:\mathrm{viscosity}\:\mathrm{of}\:\mathrm{water}\:\mathrm{flowing}\:\mathrm{steadily} \\ $$$$\mathrm{between}\:\mathrm{two}\:\mathrm{parallel}\:\mathrm{plane}.\:\mathrm{The}\:\mathrm{distance}\: \\ $$$$\mathrm{between}\:\mathrm{the}\:\mathrm{plane}\:\mathrm{is}\:\mathrm{1}.\mathrm{9km},\:\mathrm{the}\:\mathrm{third}\:\mathrm{plane} \\ $$$$\mathrm{has}\:\mathrm{a}\:\mathrm{constant}\:\mathrm{viscosity}\:\mathrm{of}\:\mathrm{20}\:\mathrm{cm}/\mathrm{sec}\:\mathrm{when}\:\mathrm{a} \\ $$$$\mathrm{force}\:\mathrm{square}\:\mathrm{300N}/\mathrm{m}^{\mathrm{3}} \:\mathrm{is}\:\mathrm{applied}. \\ $$ Terms of…
Question Number 75505 by naka3546 last updated on 12/Dec/19 Commented by mr W last updated on 12/Dec/19 $${i}\:{don}'{t}\:{think}\:{such}\:{m}\:{and}\:{n}\:{exist}. \\ $$$${the}\:{last}\:{digit}\:{from}\:{right}\:{of}\:\mathrm{2019}^{{m}} \\ $$$${is}\:\mathrm{1}\:{or}\:\mathrm{9}.\:\mathrm{5}\:{times}\:{of}\:{it}\:{is}\:{always}\:\mathrm{5}, \\ $$$${but}\:{this}\:{can}\:{not}\:{be}\:\mathrm{2019}^{{n}} ,\:{since}…
Question Number 75502 by mathocean1 last updated on 12/Dec/19 $$\left.\mathrm{S}\left.\mathrm{olve}\:\mathrm{it}\:\mathrm{in}\:\right]−\pi;\pi\right] \\ $$$$\mathrm{sin}\left(\mathrm{2x}\right)=\mathrm{cos}\left(\mathrm{x}\right) \\ $$ Commented by mathmax by abdo last updated on 12/Dec/19 $${sin}\left(\mathrm{2}{x}\right)={cosx}\:\Leftrightarrow\:{sin}\left(\mathrm{2}{x}\right)={sin}\left(\frac{\pi}{\mathrm{2}}−{x}\right)\:\Leftrightarrow\mathrm{2}{x}=\frac{\pi}{\mathrm{2}}−{x}+\mathrm{2}{k}\pi\:{or} \\…
Question Number 9962 by konen last updated on 19/Jan/17 $$\mathrm{a},\mathrm{b}\:\in\mathrm{Z}^{+} \\ $$$$\mathrm{b}^{\mathrm{2}} −\mathrm{a}^{\mathrm{2}} =\mathrm{2b}+\mathrm{7a}+\mathrm{4} \\ $$$$\Rightarrow\:\mathrm{a}+\mathrm{b}=? \\ $$ Commented by prakash jain last updated on…
Question Number 141034 by jahar last updated on 15/May/21 $${I}\:{don}'{t}\:{recover}\:{my}\:{old}\:{phone}\:{documents}. \\ $$$${please}\:{advise}\:{me}\:{in}\:{briefly}\:{how}\:{to}\:{restore} \\ $$$$\:{my}\:{old}\:{phone}\:{documents}\:{in}\:{my}\:{new} \\ $$$$\:{phone}. \\ $$$$ \\ $$$${plese}\:{help}\:{me}. \\ $$ Commented by Tinku…
Question Number 9960 by Tawakalitu ayo mi last updated on 19/Jan/17 Answered by sandy_suhendra last updated on 20/Jan/17 $$\left(\mathrm{i}\right)\:\mathrm{f}\left(−\mathrm{1}\right)=\left(−\mathrm{1}\right)^{\mathrm{2}} +\mathrm{3}\left(−\mathrm{1}\right)−\mathrm{1}=−\mathrm{3} \\ $$$$\:\:\:\:\:\:\mathrm{li}\underset{\mathrm{x}\rightarrow−\mathrm{1}} {\mathrm{m}}\:\mathrm{x}^{\mathrm{2}} +\mathrm{3x}−\mathrm{1}=−\mathrm{3} \\…
Question Number 9959 by konen last updated on 19/Jan/17 $$\mid\mathrm{x}^{\mathrm{2}} −\mathrm{25}\mid=\mathrm{4}\mid\mathrm{x}−\mathrm{5}\mid\:\:\:\Rightarrow\Sigma\mathrm{x}=? \\ $$ Answered by mrW1 last updated on 19/Jan/17 $$\mid\left({x}−\mathrm{5}\right)\left({x}+\mathrm{5}\right)\mid=\mathrm{4}\mid{x}−\mathrm{5}\mid \\ $$$${x}=\mathrm{5}\:{or} \\ $$$$\mid{x}+\mathrm{5}\mid=\mathrm{4}\:{or}…
Question Number 141031 by iloveisrael last updated on 15/May/21 $$\:\:\:\:\:\:\int_{\pi/\mathrm{6}} ^{\:\pi/\mathrm{3}} \:\sqrt{\mathrm{1}+\frac{\mathrm{cos}\:^{\mathrm{2}} {x}}{\mathrm{sin}\:{x}}}\:{dx}\:?\: \\ $$ Terms of Service Privacy Policy Contact: info@tinkutara.com
Question Number 141030 by iloveisrael last updated on 15/May/21 $$\:\:\:\:\:\:\:\:\:\:\rightarrow\langle\underset{{n}=\mathrm{1}} {\overset{\infty} {\sum}}\:\frac{\mathrm{1}}{\mathrm{9}{n}^{\mathrm{2}} +\mathrm{3}{n}}\:=?\:\rangle\leftarrow \\ $$ Commented by EDWIN88 last updated on 15/May/21 $$\:=\:\mathrm{1}−\mathrm{ln}\:\sqrt{\mathrm{3}}\:−\frac{\pi}{\mathrm{6}\sqrt{\mathrm{3}}} \\ $$$$\:\mathrm{S}=\frac{\mathrm{1}}{\mathrm{3}}\:\underset{\mathrm{n}=\mathrm{1}}…
Question Number 141024 by mathocean1 last updated on 15/May/21 $${Given}\:{X}=\left(\sqrt{\sqrt{{x}}}+\frac{\mathrm{1}}{\:\sqrt{\sqrt{{x}}}}\right)^{{n}} . \\ $$$${What}\:{is}\:{the}\:{coefficient}\:{of}\:{x}^{\mathrm{5}−\frac{\mathrm{n}}{\mathrm{4}}\:?} \\ $$$$\mathrm{propositions}: \\ $$$${a}.\:\:\:\:\mathrm{5}\frac{{n}!}{\mathrm{10}!} \\ $$$${b}.\:\:\:\:\frac{{n}!}{\mathrm{5}!} \\ $$$${c}.\:\:\:\:\:\begin{pmatrix}{{n}}\\{\mathrm{10}}\end{pmatrix} \\ $$$${d}.\:\:\:\:\:\:\begin{pmatrix}{{n}}\\{\mathrm{5}}\end{pmatrix} \\ $$…