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Question Number 77528 Answers: 0 Comments: 0

Σ_(k=1) ^∞ (k^α /2^k )=?

$$\underset{{k}=\mathrm{1}} {\overset{\infty} {\sum}}\frac{{k}^{\alpha} }{\mathrm{2}^{{k}} }=? \\ $$

Question Number 77524 Answers: 1 Comments: 2

Question Number 77523 Answers: 0 Comments: 0

how many silly questions can a person ask within the first δ days of the year ψ when the number χ_0 of his IDs∉R in the year ψ−1 is given by [ln ((ψ/2)+3M)]≤χ_0 <lim_(q_0 , x→∞) ((q_0 ^x (√(2πx)))/e^q_0 ) where M is the duration of a month measured in ((hr)/(24)) and (ψ−2)^2 +δ^3 is prime?

$$\mathrm{how}\:\mathrm{many}\:\mathrm{silly}\:\mathrm{questions}\:\mathrm{can}\:\mathrm{a}\:\mathrm{person}\:\mathrm{ask} \\ $$$$\mathrm{within}\:\mathrm{the}\:\mathrm{first}\:\delta\:\mathrm{days}\:\mathrm{of}\:\mathrm{the}\:\mathrm{year}\:\psi\:\mathrm{when} \\ $$$$\mathrm{the}\:\mathrm{number}\:\chi_{\mathrm{0}} \:\mathrm{of}\:\mathrm{his}\:\mathrm{IDs}\notin\mathbb{R}\:\mathrm{in}\:\mathrm{the}\:\mathrm{year}\:\psi−\mathrm{1} \\ $$$$\mathrm{is}\:\mathrm{given}\:\mathrm{by}\:\left[\mathrm{ln}\:\left(\frac{\psi}{\mathrm{2}}+\mathrm{3}\mathbb{M}\right)\right]\leqslant\chi_{\mathrm{0}} <\underset{{q}_{\mathrm{0}} ,\:{x}\rightarrow\infty} {\mathrm{lim}}\frac{{q}_{\mathrm{0}} ^{{x}} \sqrt{\mathrm{2}\pi{x}}}{\mathrm{e}^{{q}_{\mathrm{0}} } } \\ $$$$\mathrm{where}\:\mathbb{M}\:\mathrm{is}\:\mathrm{the}\:\mathrm{duration}\:\mathrm{of}\:\mathrm{a}\:\mathrm{month}\:\mathrm{measured} \\ $$$$\mathrm{in}\:\frac{\mathrm{hr}}{\mathrm{24}}\:\mathrm{and}\:\left(\psi−\mathrm{2}\right)^{\mathrm{2}} +\delta^{\mathrm{3}} \:\mathrm{is}\:\mathrm{prime}? \\ $$

Question Number 77514 Answers: 2 Comments: 0

Question Number 77513 Answers: 0 Comments: 3

Question Number 77506 Answers: 1 Comments: 2

Question Number 77505 Answers: 1 Comments: 1

many three digit multiples of three that can be made from the number 0,1,2,3,4,5,6,7 without repetition?

$${many}\:{three}\: \\ $$$${digit}\:{multiples}\:{of}\:{three}\:{that} \\ $$$${can}\:{be}\:{made}\:{from}\:{the}\:{number} \\ $$$$\mathrm{0},\mathrm{1},\mathrm{2},\mathrm{3},\mathrm{4},\mathrm{5},\mathrm{6},\mathrm{7}\:{without}\:{repetition}? \\ $$

Question Number 77504 Answers: 1 Comments: 0

Question Number 77491 Answers: 0 Comments: 0

Question Number 77483 Answers: 0 Comments: 1

solve y′ cos(x) +(1/2) y sin(x) = e^x (√(sin(x)))

$${solve}\: \\ $$$${y}'\:{cos}\left({x}\right)\:+\frac{\mathrm{1}}{\mathrm{2}}\:{y}\:{sin}\left({x}\right)\:=\:{e}^{{x}} \:\sqrt{{sin}\left({x}\right)}\:\: \\ $$

Question Number 77481 Answers: 1 Comments: 0

Question Number 77474 Answers: 1 Comments: 1

Prove ∫_(−1) ^1 (√(1−x^2 )) dx=(π/2)

$${Prove} \\ $$$$\int_{−\mathrm{1}} ^{\mathrm{1}} \sqrt{\mathrm{1}−{x}^{\mathrm{2}} }\:{dx}=\frac{\pi}{\mathrm{2}} \\ $$

Question Number 77473 Answers: 0 Comments: 2

Question Number 77472 Answers: 0 Comments: 5

Hello sirs... i want that you explain me how we solve the trigonometric inequality with tangente. we can take for example tan2x≥(√3) i can solve this type of equality but not the inequality! Please i need your help... Even the steps to make graphic to read the solu− tion.

$$\mathrm{Hello}\:\mathrm{sirs}...\: \\ $$$$\mathrm{i}\:\mathrm{want}\:\mathrm{that}\:\mathrm{you}\:\mathrm{explain}\:\mathrm{me}\:\mathrm{how}\: \\ $$$$\:\mathrm{we}\:\mathrm{solve}\:\mathrm{the}\:\mathrm{trigonometric} \\ $$$$\mathrm{inequality}\:\mathrm{with}\:\mathrm{tangente}.\: \\ $$$$\mathrm{we}\:\mathrm{can}\:\mathrm{take}\:\mathrm{for}\:\mathrm{example}\:\mathrm{tan2x}\geqslant\sqrt{\mathrm{3}} \\ $$$$\mathrm{i}\:\mathrm{can}\:\mathrm{solve}\:\mathrm{this}\:\mathrm{type}\:\mathrm{of}\:\mathrm{equality} \\ $$$$\mathrm{but}\:\mathrm{not}\:\mathrm{the}\:\mathrm{inequality}!\:\mathrm{Please}\: \\ $$$$\mathrm{i}\:\mathrm{need}\:\mathrm{your}\:\mathrm{help}...\:\mathrm{Even}\:\mathrm{the}\:\mathrm{steps} \\ $$$$\mathrm{to}\:\mathrm{make}\:\mathrm{graphic}\:\mathrm{to}\:\mathrm{read}\:\mathrm{the}\:\mathrm{solu}− \\ $$$$\mathrm{tion}. \\ $$

Question Number 77464 Answers: 3 Comments: 7

∫_( 0) ^(π/2) ln (2 cos x) dx = ?

$$\underset{\:\:\mathrm{0}} {\int}\:\overset{\frac{\pi}{\mathrm{2}}} {\:}\mathrm{ln}\:\left(\mathrm{2}\:\mathrm{cos}\:{x}\right)\:{dx}\:\:=\:\:? \\ $$

Question Number 77462 Answers: 0 Comments: 0