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(4*sin(100*x))'The calculation above is a derivative of the function f (x)
(4)'*sin(100*x)+4*(sin(100*x))'
0*sin(100*x)+4*(sin(100*x))'
0*sin(100*x)+4*cos(100*x)*(100*x)'
0*sin(100*x)+4*cos(100*x)*((100)'*x+100*(x)')
0*sin(100*x)+4*cos(100*x)*(0*x+100*(x)')
0*sin(100*x)+4*cos(100*x)*(0*x+100*1)
0*sin(100*x)+4*100*cos(100*x)
400*cos(100*x)
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