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find-1-1-dx-1-x-2-1-x-2-




Question Number 30568 by abdo imad last updated on 23/Feb/18
find ∫_(−1) ^1       (dx/( (√(1+x^2 )) +(√(1−x^2  )))) .
$${find}\:\int_{−\mathrm{1}} ^{\mathrm{1}} \:\:\:\:\:\:\frac{{dx}}{\:\sqrt{\mathrm{1}+{x}^{\mathrm{2}} }\:+\sqrt{\mathrm{1}−{x}^{\mathrm{2}} \:}}\:. \\ $$

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