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Link:
[url]https://ro.wikipedia.org/wiki/Centru_de_masă
Calculul folosind sage:
sage: var('x,y');
sage: J = integral( integral( 1, (y,x^2,x+2) ), (x,-1,2) )
sage: Jx = integral( integral( x, (y,x^2,x+2) ), (x,-1,2) )
sage: Jy = integral( integral( y, (y,x^2,x+2) ), (x,-1,2) )
sage: J, Jx, Jy
(9/2, 9/4, 36/5)
sage: Jx/J, Jy/J
(1/2, 8/5)
--- df (gauss)
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