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(-5*cos(-5*x))'The calculation above is a derivative of the function f (x)
(-5)'*cos(-5*x)-5*(cos(-5*x))'
0*cos(-5*x)-5*(cos(-5*x))'
0*cos(-5*x)-5*-sin(-5*x)*(-5*x)'
0*cos(-5*x)-5*-sin(-5*x)*((-5)'*x-5*(x)')
0*cos(-5*x)-5*-sin(-5*x)*(0*x-5*(x)')
0*cos(-5*x)-5*-sin(-5*x)*(0*x-5*1)
0*cos(-5*x)-5*-5*(-sin(-5*x))
0*cos(-5*x)-5*5*sin(-5*x)
-25*sin(-5*x)
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