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((1/3)*x^2-((8/5)*x^4))'The calculation above is a derivative of the function f (x)
(-((8/5)*x^4))'+((1/3)*x^2)'
(8/5)*(x^4)'+((1/3)*x^2)'+(8/5)'*x^4
(8/5)*(x^4)'+((1/3)*x^2)'+0*x^4
((1/3)*x^2)'+(8/5)*4*x^(4-1)+0*x^4
((1/3)*x^2)'+(8/5)*4*x^3+0*x^4
(1/3)*(x^2)'-32/5*x^3+(1/3)'*x^2
(1/3)*(x^2)'-32/5*x^3+0*x^2
(1/3)*2*x^(2-1)-32/5*x^3+0*x^2
(1/3)*2*x-32/5*x^3+0*x^2
(2/3)*x-((32/5)*x^3)
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