sage: x0,x1,x2,x3,x4,x5,x6,x7,x8,x9 = var('x0,x1,x2,x3,x4,x5,x6,x7,x8,x9')
sage: S = 1*x1 + 2*x3 + 3*x4 + 4*x5 + 5*x7 + 6*x9
sage: S.variables()
(x1, x3, x4, x5, x7, x9)
By the way :
sage: x=var('x')
sage: S=sin(x)**2+cos(x)**2
sage: S.variables()
(x,)
sage: S.simplify_trig().variables()
()
thus one has to be somewhat careful.
Laurent
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