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Question Number 153764 by mathdanisur last updated on 10/Sep/21

Prove without any software:  ∫_( 0) ^( 1)  ∫_( 0) ^( 1)  (√(1 - (((x + y)/2))^2 )) dxdy > (π/4)

$$\mathrm{Prove}\:\mathrm{without}\:\mathrm{any}\:\mathrm{software}: \\ $$ $$\underset{\:\mathrm{0}} {\overset{\:\mathrm{1}} {\int}}\:\underset{\:\mathrm{0}} {\overset{\:\mathrm{1}} {\int}}\:\sqrt{\mathrm{1}\:-\:\left(\frac{\mathrm{x}\:+\:\mathrm{y}}{\mathrm{2}}\right)^{\mathrm{2}} }\:\mathrm{dxdy}\:>\:\frac{\pi}{\mathrm{4}} \\ $$

Commented byalisiao last updated on 10/Sep/21

i think the result = (𝛑/2) so , (𝛑/2)>(𝛑/4)

$$\boldsymbol{{i}}\:\boldsymbol{{think}}\:\boldsymbol{{the}}\:\boldsymbol{{result}}\:=\:\frac{\boldsymbol{\pi}}{\mathrm{2}}\:\boldsymbol{{so}}\:,\:\frac{\boldsymbol{\pi}}{\mathrm{2}}>\frac{\boldsymbol{\pi}}{\mathrm{4}} \\ $$

Commented bymathdanisur last updated on 10/Sep/21

Ser,  =  (π/4) ∙ (π/4) > (π/4)

$$\mathrm{Ser},\:\:=\:\:\frac{\pi}{\mathrm{4}}\:\centerdot\:\frac{\pi}{\mathrm{4}}\:>\:\frac{\pi}{\mathrm{4}} \\ $$

Answered by alisiao last updated on 10/Sep/21

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