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