the solid lies between planes perpendicular to the x-axis at x=1 and x=-1 the cross-sections perpendicular to the x-axis are(adsbygoogle = window.adsbygoogle || []).push({});

A) circles whose diameters stretch from the curve y = -1/squrt(1+x^2) to the curve y = 1/squrt(1+x^2)

B)vertical squares whose base edges run from the curve y = -1/squrt(1+x^2) to the curve y = 1/squrt(1+x^2)

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# Intigration (volume of solids rotating about and axis)

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