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