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(2.5*sin(4*x))'The calculation above is a derivative of the function f (x)
(2.5)'*sin(4*x)+2.5*(sin(4*x))'
0*sin(4*x)+2.5*(sin(4*x))'
0*sin(4*x)+2.5*cos(4*x)*(4*x)'
0*sin(4*x)+2.5*cos(4*x)*((4)'*x+4*(x)')
0*sin(4*x)+2.5*cos(4*x)*(0*x+4*(x)')
0*sin(4*x)+2.5*cos(4*x)*(0*x+4*1)
0*sin(4*x)+2.5*4*cos(4*x)
10*cos(4*x)
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