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d/dx(15/128*x^5-403/128*x^4+2105/64*x^3+-10693/64*x^2+53119/128*x-51683/128), x=4
d/dx(15/128*x^5-403/128*x^4+2105/64*x^3+-10693/64*x^2+53119/128*x-51683/128), x=4
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