Question-214427

Question Number 214427 by ajfour last updated on 08/Dec/24

Commented by ajfour last updated on 08/Dec/24

https://youtu.be/pnMSZ77i2P8?si=OaLd0p_DlkwNYv8d

Answered by a.lgnaoui last updated on 08/Dec/24

Resolution de l equation donne x=0,60048518 alors Aire=x+1=1,60048518 autre Methode Aire= Aire[Care( OAED)]=1 2Aire(OEC)=2×(x/2)=x A=A(Care)+2A(OEC)=x+1

$$\mathrm{Resolution}\:\mathrm{de}\:\mathrm{l}\:\mathrm{equation}\:\mathrm{donne} \\ $$$$\boldsymbol{\mathrm{x}}=\mathrm{0},\mathrm{60048518} \\ $$$$\mathrm{alors}\:\:\:\:\boldsymbol{\mathrm{Aire}}=\boldsymbol{\mathrm{x}}+\mathrm{1}=\mathrm{1},\mathrm{60048518} \\ $$$$ \\ $$$$\mathrm{autre}\:\mathrm{Methode} \\ $$$$\:\mathrm{Aire}=\:\mathrm{Aire}\left[\mathrm{Care}\left(\:\mathrm{OAED}\right)\right]=\mathrm{1} \\ $$$$\mathrm{2Aire}\left(\mathrm{OEC}\right)=\mathrm{2}×\frac{\mathrm{x}}{\mathrm{2}}=\mathrm{x} \\ $$$$\mathrm{A}=\mathrm{A}\left(\mathrm{Care}\right)+\mathrm{2A}\left(\mathrm{OEC}\right)=\mathrm{x}+\mathrm{1} \\ $$$$\:\: \\ $$

Commented by a.lgnaoui last updated on 08/Dec/24

Commented by a.lgnaoui last updated on 08/Dec/24

Commented by mr W last updated on 08/Dec/24

clearly wrong! even from the diagram one can see that your x should be ≈ 1 and >1. so your answer x=0,60048518 is wrong.

$${clearly}\:{wrong}!\:{even}\:{from}\:{the} \\ $$$${diagram}\:{one}\:{can}\:{see}\:{that}\:{your}\:{x} \\ $$$${should}\:{be}\:\approx\:\mathrm{1}\:{and}\:>\mathrm{1}.\:{so}\:{your}\:{answer} \\ $$$$\boldsymbol{\mathrm{x}}=\mathrm{0},\mathrm{60048518}\:{is}\:{wrong}. \\ $$

Answered by mr W last updated on 08/Dec/24

Commented by mr W last updated on 08/Dec/24

y^2 =x^2 +2^2 ((√(x^2 −1^2 ))−1)^2 +((√(y^2 −1^2 ))−1)^2 =2^2 ((√(x^2 −1))−1)^2 +((√(x^2 +3))−1)^2 =4 ⇒x≈2.1673 Area=(((1+1)x)/2)=x≈2.1673 for exact solution: x^2 −(√(x^2 −1))=(√(x^2 +3)) x^4 −4=2x^2 (√(x^2 −1)) x^8 −4x^6 −4x^4 +16=0 let t=x^2 t^4 −4t^3 −4t^2 +16=0 ......

$${y}^{\mathrm{2}} ={x}^{\mathrm{2}} +\mathrm{2}^{\mathrm{2}} \\ $$$$\left(\sqrt{{x}^{\mathrm{2}} −\mathrm{1}^{\mathrm{2}} }−\mathrm{1}\right)^{\mathrm{2}} +\left(\sqrt{{y}^{\mathrm{2}} −\mathrm{1}^{\mathrm{2}} }−\mathrm{1}\right)^{\mathrm{2}} =\mathrm{2}^{\mathrm{2}} \\ $$$$\left(\sqrt{{x}^{\mathrm{2}} −\mathrm{1}}−\mathrm{1}\right)^{\mathrm{2}} +\left(\sqrt{{x}^{\mathrm{2}} +\mathrm{3}}−\mathrm{1}\right)^{\mathrm{2}} =\mathrm{4} \\ $$$$\Rightarrow{x}\approx\mathrm{2}.\mathrm{1673} \\ $$$${Area}=\frac{\left(\mathrm{1}+\mathrm{1}\right){x}}{\mathrm{2}}={x}\approx\mathrm{2}.\mathrm{1673} \\ $$$${for}\:{exact}\:{solution}: \\ $$$${x}^{\mathrm{2}} −\sqrt{{x}^{\mathrm{2}} −\mathrm{1}}=\sqrt{{x}^{\mathrm{2}} +\mathrm{3}} \\ $$$${x}^{\mathrm{4}} −\mathrm{4}=\mathrm{2}{x}^{\mathrm{2}} \sqrt{{x}^{\mathrm{2}} −\mathrm{1}} \\ $$$${x}^{\mathrm{8}} −\mathrm{4}{x}^{\mathrm{6}} −\mathrm{4}{x}^{\mathrm{4}} +\mathrm{16}=\mathrm{0} \\ $$$${let}\:{t}={x}^{\mathrm{2}} \\ $$$${t}^{\mathrm{4}} −\mathrm{4}{t}^{\mathrm{3}} −\mathrm{4}{t}^{\mathrm{2}} +\mathrm{16}=\mathrm{0} \\ $$$$…… \\ $$

Commented by ajfour last updated on 08/Dec/24

sin θ=(1/x)=(((√(x^2 −1))−1)/2) (1+(2/x))^2 =x^2 −1 Area=x≈ 2.1673

$$\mathrm{sin}\:\theta=\frac{\mathrm{1}}{{x}}=\frac{\sqrt{{x}^{\mathrm{2}} −\mathrm{1}}−\mathrm{1}}{\mathrm{2}} \\ $$$$\left(\mathrm{1}+\frac{\mathrm{2}}{{x}}\right)^{\mathrm{2}} ={x}^{\mathrm{2}} −\mathrm{1} \\ $$$${Area}={x}\approx\:\mathrm{2}.\mathrm{1673}\: \\ $$$$ \\ $$

Answered by Spillover last updated on 11/Dec/24

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