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(1.5*cos(((5*pi)/4)*x))'The calculation above is a derivative of the function f (x)

(1.5)'*cos(((5*pi)/4)*x)+1.5*(cos(((5*pi)/4)*x))'

0*cos(((5*pi)/4)*x)+1.5*(cos(((5*pi)/4)*x))'

0*cos(((5*pi)/4)*x)+1.5*-sin(((5*pi)/4)*x)*(((5*pi)/4)*x)'

0*cos(((5*pi)/4)*x)+1.5*-sin(((5*pi)/4)*x)*(((5*pi)/4)'*x+((5*pi)/4)*(x)')

0*cos(((5*pi)/4)*x)+1.5*-sin(((5*pi)/4)*x)*(0*x+((5*pi)/4)*(x)')

0*cos(((5*pi)/4)*x)+1.5*-sin(((5*pi)/4)*x)*(0*x+((5*pi)/4)*1)

0*cos(((5*pi)/4)*x)+1.5*((5*pi)/4)*(-sin(((5*pi)/4)*x))

0*cos(((5*pi)/4)*x)+1.5*((-5*pi*sin((5*pi*x)/4))/4)

-1.875*pi*sin((5*pi*x)/4)

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