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f(x) = 2x^2 - x^4 /4 + 8x + x^5/10 - 4x^3 / 3, find f(2)-f(1)
f(x) = 2x^2 - x^4 /4 + 8x + x^5/10 - 4x^3 / 3, find f(2)-f(1)
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