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