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Question Number 163988 Answers: 0 Comments: 1

if here are 20 apple in a box, how many are the significant figures in it?

$${if}\:{here}\:{are}\:\mathrm{20}\:{apple}\:{in}\:{a}\:{box},\:{how}\:{many}\: \\ $$$${are}\:{the}\:{significant}\:{figures}\:{in}\:{it}? \\ $$

Question Number 163985 Answers: 0 Comments: 0

Question Number 163986 Answers: 1 Comments: 0

((1000))^(1/3) ln^(80) (ln(8/5)−ln((8e)/5))^(80) is simplified form equl to=?

$$\sqrt[{\mathrm{3}}]{\mathrm{1000}}{ln}^{\mathrm{80}} \left({ln}\frac{\mathrm{8}}{\mathrm{5}}−{ln}\frac{\mathrm{8}{e}}{\mathrm{5}}\right)^{\mathrm{80}} \\ $$$${is}\:\:\:\:{simplified}\:\:{form}\:\:{equl}\:\:{to}=? \\ $$$$ \\ $$

Question Number 163978 Answers: 0 Comments: 5

Question Number 163976 Answers: 0 Comments: 0

plot the single-side and double-side line spectrum of g(t) g(t)=2sin^2 (10^3 πt)−10sin(10^3 πt−(π/6))

$${plot}\:{the}\:{single}-{side}\:{and}\:{double}-{side} \\ $$$${line}\:{spectrum}\:{of}\:{g}\left({t}\right) \\ $$$${g}\left({t}\right)=\mathrm{2}{sin}^{\mathrm{2}} \left(\mathrm{10}^{\mathrm{3}} \pi{t}\right)−\mathrm{10}{sin}\left(\mathrm{10}^{\mathrm{3}} \pi{t}−\frac{\pi}{\mathrm{6}}\right) \\ $$

Question Number 163974 Answers: 1 Comments: 1

is light a matter?

$${is}\:{light}\:{a}\:{matter}? \\ $$

Question Number 163972 Answers: 0 Comments: 1

Question Number 163968 Answers: 1 Comments: 0

(−2^2 )^3 =?

$$\left(−\mathrm{2}^{\mathrm{2}} \right)^{\mathrm{3}} =? \\ $$

Question Number 163966 Answers: 1 Comments: 0

lim_(x→(π/2)) (((√(2tan^2 x+3))−(√(2tan^2 x+10)))/(cot x)) =?

$$\:\:\:\:\:\:\underset{{x}\rightarrow\frac{\pi}{\mathrm{2}}} {\mathrm{lim}}\:\frac{\sqrt{\mathrm{2tan}\:^{\mathrm{2}} \mathrm{x}+\mathrm{3}}−\sqrt{\mathrm{2tan}\:^{\mathrm{2}} \mathrm{x}+\mathrm{10}}}{\mathrm{cot}\:\mathrm{x}}\:=? \\ $$

Question Number 163961 Answers: 1 Comments: 0

lim_(x→1^− ) (e^(1/(x^2 −1)) /(x−1))=?

$$\underset{\mathrm{x}\rightarrow\mathrm{1}^{−} } {\mathrm{lim}}\:\frac{\mathrm{e}^{\frac{\mathrm{1}}{\mathrm{x}^{\mathrm{2}} −\mathrm{1}}} }{\mathrm{x}−\mathrm{1}}=? \\ $$

Question Number 163954 Answers: 4 Comments: 0

Question Number 163960 Answers: 1 Comments: 0

lim_(x→0) (((√(2+7cot^2 x))−(√(7+7cot^2 x)))/(tan x)) =?

$$\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\underset{{x}\rightarrow\mathrm{0}} {\mathrm{lim}}\:\frac{\sqrt{\mathrm{2}+\mathrm{7cot}\:^{\mathrm{2}} \mathrm{x}}−\sqrt{\mathrm{7}+\mathrm{7cot}\:^{\mathrm{2}} \mathrm{x}}}{\mathrm{tan}\:\mathrm{x}}\:=? \\ $$

Question Number 163959 Answers: 0 Comments: 0

Question Number 163958 Answers: 0 Comments: 0

Question Number 163957 Answers: 1 Comments: 0

Question Number 163956 Answers: 0 Comments: 0

Question Number 163955 Answers: 0 Comments: 0

Question Number 163942 Answers: 1 Comments: 0

f(2x)−2[ f(x) ]^2 +1=0 f(x)=?

$${f}\left(\mathrm{2}{x}\right)−\mathrm{2}\left[\:{f}\left({x}\right)\:\right]^{\mathrm{2}} +\mathrm{1}=\mathrm{0} \\ $$$${f}\left({x}\right)=? \\ $$

Question Number 163939 Answers: 0 Comments: 0

An old unsolved question#1132 let S={1,2,3,4,5}, if A,B,C is such that A∩B∩C=∅ A∩B≠∅ A∩C≠∅ how many ways can be choose A,B and C

$$\mathrm{An}\:\mathrm{old}\:\mathrm{unsolved}\:\mathrm{question}#\mathrm{1132} \\ $$$$\mathrm{let}\:\mathrm{S}=\left\{\mathrm{1},\mathrm{2},\mathrm{3},\mathrm{4},\mathrm{5}\right\},\:\mathrm{if}\:\mathrm{A},\mathrm{B},\mathrm{C}\:\mathrm{is}\:\mathrm{such}\:\mathrm{that} \\ $$$$\mathrm{A}\cap\mathrm{B}\cap\mathrm{C}=\varnothing \\ $$$$\mathrm{A}\cap\mathrm{B}\neq\varnothing \\ $$$$\mathrm{A}\cap\mathrm{C}\neq\varnothing \\ $$$$\mathrm{how}\:\mathrm{many}\:\mathrm{ways}\:\mathrm{can}\:\mathrm{be}\:\mathrm{choose}\:\mathrm{A},\mathrm{B}\:\mathrm{and} \\ $$$$\mathrm{C} \\ $$

Question Number 163938 Answers: 1 Comments: 0

lim_(x→0) ((cos (−3x)−cos (3x))/(sin^2 (x(√5) )))=?

$$\:\:\:\:\:\:\:\:\underset{{x}\rightarrow\mathrm{0}} {\mathrm{lim}}\:\frac{\mathrm{cos}\:\left(−\mathrm{3}{x}\right)−\mathrm{cos}\:\left(\mathrm{3}{x}\right)}{\mathrm{sin}\:^{\mathrm{2}} \left({x}\sqrt{\mathrm{5}}\:\right)}=? \\ $$

Question Number 163936 Answers: 1 Comments: 0

cos^(−1) (((x^2 −1)/(x^2 +1)))+(1/2)tan^(−1) (((2x)/(1−x^2 )))=((2π)/3)

$$\:\mathrm{cos}^{−\mathrm{1}} \left(\frac{{x}^{\mathrm{2}} −\mathrm{1}}{{x}^{\mathrm{2}} +\mathrm{1}}\right)+\frac{\mathrm{1}}{\mathrm{2}}\mathrm{tan}^{−\mathrm{1}} \left(\frac{\mathrm{2}{x}}{\mathrm{1}−{x}^{\mathrm{2}} }\right)=\frac{\mathrm{2}\pi}{\mathrm{3}} \\ $$

Question Number 163934 Answers: 0 Comments: 0

Let y(x) be the solution of x^2 y′′(x)−2y(x)=0 → { ((y(1)=1)),((y(2)=1)) :} y(3)=?

$${Let}\:{y}\left({x}\right)\:{be}\:{the}\:{solution}\:{of}\: \\ $$$$\:\:{x}^{\mathrm{2}} \:{y}''\left({x}\right)−\mathrm{2}{y}\left({x}\right)=\mathrm{0}\:\rightarrow\begin{cases}{{y}\left(\mathrm{1}\right)=\mathrm{1}}\\{{y}\left(\mathrm{2}\right)=\mathrm{1}}\end{cases} \\ $$$$\:{y}\left(\mathrm{3}\right)=? \\ $$

Question Number 163931 Answers: 1 Comments: 0

lim_(x→0) (x^x^x /x)=? pleas help

$$\underset{{x}\rightarrow\mathrm{0}} {\mathrm{lim}}\frac{{x}^{{x}^{{x}} } }{{x}}=? \\ $$$${pleas}\:\:{help} \\ $$

Question Number 163928 Answers: 1 Comments: 0

f(x)=((2x^(100!) )/(100!))+x^(100) +1 find ((d^(100!) f(x))/dx^(100!) )=?

$${f}\left({x}\right)=\frac{\mathrm{2}{x}^{\mathrm{100}!} }{\mathrm{100}!}+{x}^{\mathrm{100}} +\mathrm{1} \\ $$$${find}\:\:\:\frac{{d}^{\mathrm{100}!} {f}\left({x}\right)}{{dx}^{\mathrm{100}!} }=? \\ $$

Question Number 163926 Answers: 2 Comments: 0

{: ((sin θ=1−sin^2 θ)),((csc^2 θ−tan^2 θ =? )) }

$$\:\:\:\:\:\:\:\:\:\:\:\:\:\left.\begin{matrix}{\mathrm{sin}\:\theta=\mathrm{1}−\mathrm{sin}\:^{\mathrm{2}} \theta}\\{\mathrm{csc}\:^{\mathrm{2}} \theta−\mathrm{tan}\:^{\mathrm{2}} \theta\:=?\:}\end{matrix}\right\} \\ $$

Question Number 163921 Answers: 2 Comments: 0

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