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((1/30)*(x-120)^2)'The calculation above is a derivative of the function f (x)
(1/30)'*(x-120)^2+(1/30)*((x-120)^2)'
0*(x-120)^2+(1/30)*((x-120)^2)'
0*(x-120)^2+(1/30)*2*(x-120)^(2-1)*(x-120)'
0*(x-120)^2+(1/30)*2*(x-120)^(2-1)*((x)'+(-120)')
0*(x-120)^2+(1/30)*2*(x-120)^(2-1)*((-120)'+1)
0*(x-120)^2+(1/30)*2*(x-120)^(2-1)*(0+1)
0*(x-120)^2+(1/30)*2*(x-120)^(2-1)*1
0*(x-120)^2+(1/30)*2*(x-120)
(1/15)*(x-120)
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