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(-9*sin(3*x))'The calculation above is a derivative of the function f (x)
(-9)'*sin(3*x)-9*(sin(3*x))'
0*sin(3*x)-9*(sin(3*x))'
0*sin(3*x)-9*cos(3*x)*(3*x)'
0*sin(3*x)-9*cos(3*x)*((3)'*x+3*(x)')
0*sin(3*x)-9*cos(3*x)*(0*x+3*(x)')
0*sin(3*x)-9*cos(3*x)*(0*x+3*1)
0*sin(3*x)-9*3*cos(3*x)
-27*cos(3*x)
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