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Question Number 117371 Answers: 0 Comments: 0

Question Number 117369 Answers: 1 Comments: 0

Find the units digit of 2013^1 +2013^2 +2013^3 +...+2013^(2013)

$$\mathrm{Find}\:\mathrm{the}\:\mathrm{units}\:\mathrm{digit}\:\mathrm{of}\:\mathrm{2013}^{\mathrm{1}} +\mathrm{2013}^{\mathrm{2}} +\mathrm{2013}^{\mathrm{3}} +...+\mathrm{2013}^{\mathrm{2013}} \\ $$

Question Number 117366 Answers: 0 Comments: 0

Σ_(n=1) ^∞ (((2n)!)/(n^(2n) n!(2n+1)))

$$\underset{{n}=\mathrm{1}} {\overset{\infty} {\sum}}\frac{\left(\mathrm{2}{n}\right)!}{{n}^{\mathrm{2}{n}} {n}!\left(\mathrm{2}{n}+\mathrm{1}\right)} \\ $$

Question Number 117365 Answers: 1 Comments: 1

Express ((1/2))! in terms of infinite series

$${Express}\:\left(\frac{\mathrm{1}}{\mathrm{2}}\right)!\:\:{in}\:{terms}\:{of}\:{infinite}\:{series} \\ $$

Question Number 117348 Answers: 0 Comments: 1

Question Number 117344 Answers: 1 Comments: 4

Question Number 117342 Answers: 2 Comments: 0

(1)∫ (tan^(−1) (x))^2 dx = ? (2) ∫ tan^(−1) ((√x)) dx =?

$$\:\left(\mathrm{1}\right)\int\:\left(\mathrm{tan}^{−\mathrm{1}} \left(\mathrm{x}\right)\right)^{\mathrm{2}} \:\mathrm{dx}\:=\:? \\ $$$$\left(\mathrm{2}\right)\:\int\:\mathrm{tan}^{−\mathrm{1}} \left(\sqrt{\mathrm{x}}\right)\:\mathrm{dx}\:=? \\ $$

Question Number 117341 Answers: 0 Comments: 0

Question Number 117339 Answers: 1 Comments: 0

a coin tossed 8 times. Probability of appearing head at least 3 times is __

$${a}\:{coin}\:{tossed}\:\mathrm{8}\:{times}.\:{Probability} \\ $$$${of}\:{appearing}\:{head}\:{at}\:{least}\:\mathrm{3}\:{times}\:{is} \\ $$$$\_\_ \\ $$

Question Number 117329 Answers: 1 Comments: 0

nice math evaluate:: Ω=∫_0 ^( 1) ((arctan(x).ln(1−x))/(1+x^2 ))dx??? m.n.1970

$$\:\:\:\:\:\:\:\:\:{nice}\:\:{math} \\ $$$$\:\:{evaluate}:: \\ $$$$ \\ $$$$\:\:\:\: \\ $$$$\:\: \\ $$$$ \\ $$$$\:\:\:\Omega=\int_{\mathrm{0}} ^{\:\mathrm{1}} \frac{{arctan}\left({x}\right).{ln}\left(\mathrm{1}−{x}\right)}{\mathrm{1}+{x}^{\mathrm{2}} }{dx}??? \\ $$$$\:\:\:\:\:\:\:\:\:{m}.{n}.\mathrm{1970} \\ $$$$ \\ $$

Question Number 117311 Answers: 2 Comments: 0

Question Number 117299 Answers: 0 Comments: 2

Question Number 117281 Answers: 1 Comments: 0

In how many different ways can we select 5 numbers from 9 numbers {1,2,3,...,9}? A number may be selected more than one time.

$${In}\:{how}\:{many}\:{different}\:{ways}\:{can}\:{we} \\ $$$${select}\:\mathrm{5}\:{numbers}\:{from}\:\mathrm{9}\:{numbers} \\ $$$$\left\{\mathrm{1},\mathrm{2},\mathrm{3},...,\mathrm{9}\right\}?\: \\ $$$${A}\:{number}\:{may}\:{be}\:{selected}\:{more}\:{than} \\ $$$${one}\:{time}. \\ $$

Question Number 117280 Answers: 1 Comments: 0

... advanced calculus... prove that:: ∫_0 ^( 1) ln(Γ(x)).cos^2 (πx)dx =((ln(2π))/4)+(1/8) m.n.1970

$$\:\:\:\:\:\:\:\:\:\:\: \\ $$$$\:\:\:\:\:\:\:\:\:\:\:\:\:\:...\:{advanced}\:\:{calculus}...\: \\ $$$$ \\ $$$$\:\:\:\:\:\:{prove}\:\:{that}:: \\ $$$$ \\ $$$$\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\int_{\mathrm{0}} ^{\:\mathrm{1}} {ln}\left(\Gamma\left({x}\right)\right).{cos}^{\mathrm{2}} \left(\pi{x}\right){dx} \\ $$$$ \\ $$$$\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:=\frac{{ln}\left(\mathrm{2}\pi\right)}{\mathrm{4}}+\frac{\mathrm{1}}{\mathrm{8}} \\ $$$$\:\:\:\:\:\:\:{m}.{n}.\mathrm{1970} \\ $$$$\: \\ $$

Question Number 117263 Answers: 3 Comments: 2

dear admint tinkutara

$$\mathrm{dear}\:\mathrm{admint}\:\mathrm{tinkutara} \\ $$

Question Number 117259 Answers: 2 Comments: 0

Question Number 117258 Answers: 1 Comments: 0

(4/3).(9/8).((49)/(48)).((121)/(120)).((169)/(168)).((289)/(288)).((529)/(528)).((831)/(830)).....∞

$$\frac{\mathrm{4}}{\mathrm{3}}.\frac{\mathrm{9}}{\mathrm{8}}.\frac{\mathrm{49}}{\mathrm{48}}.\frac{\mathrm{121}}{\mathrm{120}}.\frac{\mathrm{169}}{\mathrm{168}}.\frac{\mathrm{289}}{\mathrm{288}}.\frac{\mathrm{529}}{\mathrm{528}}.\frac{\mathrm{831}}{\mathrm{830}}.....\infty \\ $$

Question Number 117257 Answers: 1 Comments: 1

If sin^2 (x)+cos^2 (x)=1 then what the value of sin^(11) (x)+cos^(11) (x) =?

$${If}\:\mathrm{sin}\:^{\mathrm{2}} \left({x}\right)+\mathrm{cos}\:^{\mathrm{2}} \left({x}\right)=\mathrm{1}\:{then}\: \\ $$$${what}\:{the}\:{value}\:{of}\:\mathrm{sin}\:^{\mathrm{11}} \left({x}\right)+\mathrm{cos}\:^{\mathrm{11}} \left({x}\right)\:=? \\ $$

Question Number 117253 Answers: 3 Comments: 0

calculate ∫_(−∞) ^∞ (x^2 /((x^2 −x +1)^2 ))dx

$$\mathrm{calculate}\:\int_{−\infty} ^{\infty} \:\:\frac{\mathrm{x}^{\mathrm{2}} }{\left(\mathrm{x}^{\mathrm{2}} −\mathrm{x}\:+\mathrm{1}\right)^{\mathrm{2}} }\mathrm{dx} \\ $$

Question Number 117255 Answers: 0 Comments: 0

Question Number 117251 Answers: 0 Comments: 0

let f(x)= ln(3−sin(2x)) developp f at fourier serie

$$\mathrm{let}\:\mathrm{f}\left(\mathrm{x}\right)=\:\mathrm{ln}\left(\mathrm{3}−\mathrm{sin}\left(\mathrm{2x}\right)\right) \\ $$$$\mathrm{developp}\:\mathrm{f}\:\mathrm{at}\:\mathrm{fourier}\:\mathrm{serie} \\ $$

Question Number 117250 Answers: 1 Comments: 0

calculate lim_(x→0) ((sin(xsh(2x))−sh(x sin(2x)))/x^3 )

$$\mathrm{calculate}\:\mathrm{lim}_{\mathrm{x}\rightarrow\mathrm{0}} \:\:\:\frac{\mathrm{sin}\left(\mathrm{xsh}\left(\mathrm{2x}\right)\right)−\mathrm{sh}\left(\mathrm{x}\:\mathrm{sin}\left(\mathrm{2x}\right)\right)}{\mathrm{x}^{\mathrm{3}} } \\ $$

Question Number 117249 Answers: 1 Comments: 0

calculate ∫_0 ^∞ (((−1)^x^2 )/(x^4 +x^2 +1))dx

$$\mathrm{calculate}\:\int_{\mathrm{0}} ^{\infty} \:\:\frac{\left(−\mathrm{1}\right)^{\mathrm{x}^{\mathrm{2}} } }{\mathrm{x}^{\mathrm{4}} \:+\mathrm{x}^{\mathrm{2}} \:+\mathrm{1}}\mathrm{dx}\: \\ $$

Question Number 117243 Answers: 1 Comments: 1

Question Number 117228 Answers: 1 Comments: 0

(((x+y)/(y−1))) dx −(1/2)(((x+1)/(y−1)))^2 dy = 0

$$\left(\frac{{x}+{y}}{{y}−\mathrm{1}}\right)\:{dx}\:−\frac{\mathrm{1}}{\mathrm{2}}\left(\frac{{x}+\mathrm{1}}{{y}−\mathrm{1}}\right)^{\mathrm{2}} {dy}\:=\:\mathrm{0} \\ $$

Question Number 117227 Answers: 0 Comments: 0

why every function that is Riemann integrable is not lebsgue integrable?

$${why}\:{every}\:{function}\:{that}\:{is}\:{Riemann} \\ $$$${integrable}\:{is}\:{not}\:{lebsgue}\:{integrable}? \\ $$

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