(1) ç» y=-1,V1 = â« Ï[(x+1)^2-(x^2+1)^2]dx
= â« Ï(2x-x^2-x^4)dx = Ï[x^2-x^3/3-x^5/5] = 7Ï/15.
(2) ç» x=-1,V2 = â« Ï[(ây+1)^2-(y+1)^2]dy
= â« Ï(2ây-y-y^2)dx = Ï[(4/3)y^(3/2)-y^2/2-y^3/3] = Ï/2.
æç¨æ±å£³æ³,V2 = â« 2Ï(x+1)(x-x^2)dx
= â« 2Ï(x-x^3)dx = Ï[x^2-x^4/2] = Ï/2
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