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Question Number 64574 by ajfour last updated on 19/Jul/19

Commented by ajfour last updated on 19/Jul/19

Find polynomial function p(x)  if coloured area is a maximum.

$${Find}\:{polynomial}\:{function}\:{p}\left({x}\right) \\ $$$${if}\:{coloured}\:{area}\:{is}\:{a}\:{maximum}. \\ $$

Commented by mr W last updated on 19/Jul/19

nice question sir!

$${nice}\:{question}\:{sir}! \\ $$

Commented by behi83417@gmail.com last updated on 19/Jul/19

.

$$. \\ $$

Commented by ajfour last updated on 19/Jul/19

very brief solution behi Sir.

$${very}\:{brief}\:{solution}\:{behi}\:{Sir}. \\ $$

Commented by behi83417@gmail.com last updated on 19/Jul/19

sir Ajfour!thank you so much for shearing  this  nice question.I have no idea for  solving this now,but I want to follow  the solution and to recive notifications  of Q,I put a ′.′.please excuse sir.

$$\mathrm{sir}\:\mathrm{Ajfour}!\mathrm{thank}\:\mathrm{you}\:\mathrm{so}\:\mathrm{much}\:\mathrm{for}\:\mathrm{shearing} \\ $$$$\mathrm{this}\:\:\mathrm{nice}\:\mathrm{question}.\mathrm{I}\:\mathrm{have}\:\mathrm{no}\:\mathrm{idea}\:\mathrm{for} \\ $$$$\mathrm{solving}\:\mathrm{this}\:\mathrm{now},\mathrm{but}\:\mathrm{I}\:\mathrm{want}\:\mathrm{to}\:\mathrm{follow} \\ $$$$\mathrm{the}\:\mathrm{solution}\:\mathrm{and}\:\mathrm{to}\:\mathrm{recive}\:\mathrm{notifications} \\ $$$$\mathrm{of}\:\mathrm{Q},\mathrm{I}\:\mathrm{put}\:\mathrm{a}\:'.'.\mathrm{please}\:\mathrm{excuse}\:\mathrm{sir}. \\ $$

Commented by ajfour last updated on 19/Jul/19

Happy is he who knows the  reason of things, thanks for  the reason. It dint occur me.

$$\mathcal{H}{appy}\:{is}\:{he}\:{who}\:{knows}\:{the} \\ $$$${reason}\:{of}\:{things},\:{thanks}\:{for} \\ $$$${the}\:{reason}.\:{It}\:{dint}\:{occur}\:{me}. \\ $$

Commented by MJS last updated on 19/Jul/19

if any function was allowed it would be an  ellipse I guess (please check this idea)  a circle only if s=(π/2)a  the problem then would be, the perimeter  of an ellipse cannot be found exactly  but maybe we could find a taylor polynome    for the upper half circle  y=(√(1−x^2 ))  the taylor polynomes are  1  1−(x^2 /2)  1−(x^2 /2)−(x^4 /8)  1−(x^2 /2)−(x^4 /8)−(x^6 /(16))  1−(x^2 /2)−(x^4 /8)−(x^6 /(16))−((5x^8 )/(128))  1−(x^2 /2)−(x^4 /8)−(x^6 /(16))−((5x^8 )/(128))−((7x^(10) )/(256))  ...

$$\mathrm{if}\:\mathrm{any}\:\mathrm{function}\:\mathrm{was}\:\mathrm{allowed}\:\mathrm{it}\:\mathrm{would}\:\mathrm{be}\:\mathrm{an} \\ $$$$\mathrm{ellipse}\:\mathrm{I}\:\mathrm{guess}\:\left(\mathrm{please}\:\mathrm{check}\:\mathrm{this}\:\mathrm{idea}\right) \\ $$$$\mathrm{a}\:\mathrm{circle}\:\mathrm{only}\:\mathrm{if}\:{s}=\frac{\pi}{\mathrm{2}}{a} \\ $$$$\mathrm{the}\:\mathrm{problem}\:\mathrm{then}\:\mathrm{would}\:\mathrm{be},\:\mathrm{the}\:\mathrm{perimeter} \\ $$$$\mathrm{of}\:\mathrm{an}\:\mathrm{ellipse}\:\mathrm{cannot}\:\mathrm{be}\:\mathrm{found}\:\mathrm{exactly} \\ $$$$\mathrm{but}\:\mathrm{maybe}\:\mathrm{we}\:\mathrm{could}\:\mathrm{find}\:\mathrm{a}\:\mathrm{taylor}\:\mathrm{polynome} \\ $$$$ \\ $$$$\mathrm{for}\:\mathrm{the}\:\mathrm{upper}\:\mathrm{half}\:\mathrm{circle} \\ $$$${y}=\sqrt{\mathrm{1}−{x}^{\mathrm{2}} } \\ $$$$\mathrm{the}\:\mathrm{taylor}\:\mathrm{polynomes}\:\mathrm{are} \\ $$$$\mathrm{1} \\ $$$$\mathrm{1}−\frac{{x}^{\mathrm{2}} }{\mathrm{2}} \\ $$$$\mathrm{1}−\frac{{x}^{\mathrm{2}} }{\mathrm{2}}−\frac{{x}^{\mathrm{4}} }{\mathrm{8}} \\ $$$$\mathrm{1}−\frac{{x}^{\mathrm{2}} }{\mathrm{2}}−\frac{{x}^{\mathrm{4}} }{\mathrm{8}}−\frac{{x}^{\mathrm{6}} }{\mathrm{16}} \\ $$$$\mathrm{1}−\frac{{x}^{\mathrm{2}} }{\mathrm{2}}−\frac{{x}^{\mathrm{4}} }{\mathrm{8}}−\frac{{x}^{\mathrm{6}} }{\mathrm{16}}−\frac{\mathrm{5}{x}^{\mathrm{8}} }{\mathrm{128}} \\ $$$$\mathrm{1}−\frac{{x}^{\mathrm{2}} }{\mathrm{2}}−\frac{{x}^{\mathrm{4}} }{\mathrm{8}}−\frac{{x}^{\mathrm{6}} }{\mathrm{16}}−\frac{\mathrm{5}{x}^{\mathrm{8}} }{\mathrm{128}}−\frac{\mathrm{7}{x}^{\mathrm{10}} }{\mathrm{256}} \\ $$$$... \\ $$

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