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(-((10/8)*x^2))'The calculation above is a derivative of the function f (x)
(10/8)'*x^2+(10/8)*(x^2)'
0*x^2+(10/8)*(x^2)'
0*x^2+(10/8)*2*x^(2-1)
0*x^2+(10/8)*2*x
(-5/2)*x
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