f(x) = − 1/7(x^-7-x^14)
Y = (-1/7)X^-7 + (1/7)X^14, Multiply the coefficient of X (1/7) by the exponent and subtract 1 from the exponent: dy/dx = 1X^-8 + 2X^13, dy/dx = 1/X^8 + 2X^13.
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