f(x) = anxn + an – 1xn– 1 + … + a1x + ao
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g(x) = bnxn + bn – 1xn– 1 + … + b1x + bo
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f(x) - g(x) = (an - bn)xn + (an– 1 - bn – 1)xn– 1 + ..… + (a1 - b1)x + (ao - bo)
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