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Is that what you want
sage: s = factor(2*c^2+2*a^2-b^2)
sage: s.operands()
[3*p*t^2 - 2*p^2 - 2*p*t + t^2 + p + 2*t + 1, 2]
sage: m = s.operands()[0]
sage: m
3*p*t^2 - 2*p^2 - 2*p*t + t^2 + p + 2*t + 1
