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((-pi/3)*sin((pi*x)/3))'The calculation above is a derivative of the function f (x)
(-pi/3)'*sin((pi*x)/3)+(-pi/3)*(sin((pi*x)/3))'
0*sin((pi*x)/3)+(-pi/3)*(sin((pi*x)/3))'
0*sin((pi*x)/3)+(-pi/3)*cos((pi*x)/3)*((pi*x)/3)'
0*sin((pi*x)/3)+(-pi/3)*cos((pi*x)/3)*(((pi*x)'*3-(pi*x*(3)'))/(3^2))
0*sin((pi*x)/3)+(-pi/3)*cos((pi*x)/3)*((((pi)'*x+pi*(x)')*3-(pi*x*(3)'))/(3^2))
0*sin((pi*x)/3)+(-pi/3)*cos((pi*x)/3)*(((0*x+pi*(x)')*3-(pi*x*(3)'))/(3^2))
0*sin((pi*x)/3)+(-pi/3)*cos((pi*x)/3)*(((0*x+pi*1)*3-(pi*x*(3)'))/(3^2))
0*sin((pi*x)/3)+(-pi/3)*cos((pi*x)/3)*((pi*3-(pi*x*(3)'))/(3^2))
0*sin((pi*x)/3)+(-pi/3)*cos((pi*x)/3)*((pi*3-(pi*x*0))/(3^2))
0*sin((pi*x)/3)+(-pi/3)*(pi/3)*cos((pi*x)/3)
0*sin((pi*x)/3)+(-pi/3)*((pi*cos((pi*x)/3))/3)
(1/9)*pi^2*cos((pi*x)/3)
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