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(0.4*sin(2*pi*x))'The calculation above is a derivative of the function f (x)
(0.4)'*sin(2*pi*x)+0.4*(sin(2*pi*x))'
0*sin(2*pi*x)+0.4*(sin(2*pi*x))'
0*sin(2*pi*x)+0.4*cos(2*pi*x)*(2*pi*x)'
0*sin(2*pi*x)+0.4*cos(2*pi*x)*((2*pi)'*x+2*pi*(x)')
0*sin(2*pi*x)+0.4*cos(2*pi*x)*(0*x+2*pi*(x)')
0*sin(2*pi*x)+0.4*cos(2*pi*x)*(0*x+2*pi*1)
0*sin(2*pi*x)+0.4*2*pi*cos(2*pi*x)
0.8*pi*cos(2*pi*x)
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