a: =4x+2x^2-x^3-2x^2+x^3-4x+3=3
b: =24-4x+2x^2+3x^3-5x^2+4x+3x^2-3x^3=24
c: =x^4-x^3-3x^2+2x-x^4-x^3-3x^2+2x^2+2x+6+4x^2-4x-8
=-2
d: =x^2n-2x^n+x^n-2-x^2n+x^n+2009=2009
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