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most hated trigonometric problem: sin( (π/7))sin (((2π)/7))sin (((3π)/7))=?

$${most}\:{hated}\:{trigonometric} \\ $$$${problem}: \\ $$$$\mathrm{sin}\left(\:\frac{\pi}{\mathrm{7}}\right)\mathrm{sin}\:\left(\frac{\mathrm{2}\pi}{\mathrm{7}}\right)\mathrm{sin}\:\left(\frac{\mathrm{3}\pi}{\mathrm{7}}\right)=? \\ $$

Question Number 226400 Answers: 0 Comments: 0

Prove klein bottle is Immersion but klein bottle can′t Imbedding in R^3 Space

$$\mathrm{Prove}\:\mathrm{klein}\:\mathrm{bottle}\:\mathrm{is}\:\mathrm{Immersion} \\ $$$$\mathrm{but}\:\mathrm{klein}\:\mathrm{bottle}\:\mathrm{can}'\mathrm{t}\:\mathrm{Imbedding}\:\mathrm{in}\:\mathbb{R}^{\mathrm{3}} \:\mathrm{Space}\: \\ $$

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compute the double integral ∫_(y=0) ^1 ∫_(x=0) ^2 x^2 dxdy and ∫_(y=0) ^1 ∫_(x=0) ^2 y^2 dxdy

$$\boldsymbol{\mathrm{compute}}\:\boldsymbol{\mathrm{the}}\:\boldsymbol{\mathrm{double}}\:\boldsymbol{\mathrm{integral}} \\ $$$$\int_{\boldsymbol{\mathrm{y}}=\mathrm{0}} ^{\mathrm{1}} \int_{\boldsymbol{\mathrm{x}}=\mathrm{0}} ^{\mathrm{2}} \boldsymbol{\mathrm{x}}^{\mathrm{2}} \boldsymbol{\mathrm{dxdy}}\:\boldsymbol{\mathrm{and}}\:\:\int_{\boldsymbol{\mathrm{y}}=\mathrm{0}} ^{\mathrm{1}} \int_{\boldsymbol{\mathrm{x}}=\mathrm{0}} ^{\mathrm{2}} \boldsymbol{\mathrm{y}}^{\mathrm{2}} \boldsymbol{\mathrm{dxdy}} \\ $$$$ \\ $$

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calculate the volume of a sphere using double integral

$${calculate}\:{the}\:{volume}\:{of}\:{a}\:{sphere} \\ $$$${using}\:{double}\:{integral} \\ $$

Question Number 226351 Answers: 1 Comments: 0

Prove Mo^ bious String is Not a Orientated Surface. σ(u,θ)= { (((1−u∙sin((1/2)θ))cos(θ))),(((1−u∙sin((1/2)θ))sin(θ))),((u∙cos((1/2)θ))) :} , −(1/2)≤u≤(1/2) , 0≤θ≤2π

$$\mathrm{Prove}\:\mathrm{M}\ddot {\mathrm{o}bious}\:\mathrm{String}\:\mathrm{is}\:\mathrm{Not}\:\mathrm{a}\:\mathrm{Orientated}\:\mathrm{Surface}. \\ $$$$\sigma\left({u},\theta\right)=\begin{cases}{\left(\mathrm{1}−{u}\centerdot\mathrm{sin}\left(\frac{\mathrm{1}}{\mathrm{2}}\theta\right)\right)\mathrm{cos}\left(\theta\right)}\\{\left(\mathrm{1}−{u}\centerdot\mathrm{sin}\left(\frac{\mathrm{1}}{\mathrm{2}}\theta\right)\right)\mathrm{sin}\left(\theta\right)}\\{{u}\centerdot\mathrm{cos}\left(\frac{\mathrm{1}}{\mathrm{2}}\theta\right)}\end{cases}\:\:,\:−\frac{\mathrm{1}}{\mathrm{2}}\leq{u}\leq\frac{\mathrm{1}}{\mathrm{2}}\:,\:\mathrm{0}\leq\theta\leq\mathrm{2}\pi \\ $$

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