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(400-((x^2)/30))'The calculation above is a derivative of the function f (x)
(-((x^2)/30))'+(400)'
((x^2)'*30-(x^2*(30)'))/(30^2)+(400)'
(2*x^(2-1)*30-(x^2*(30)'))/(30^2)+(400)'
(2*x*30-(x^2*(30)'))/(30^2)+(400)'
(2*x*30-(x^2*0))/(30^2)+(400)'
0-(x/15)
-(x/15)
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