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(3*sin(-4*x))'The calculation above is a derivative of the function f (x)
(3)'*sin(-4*x)+3*(sin(-4*x))'
0*sin(-4*x)+3*(sin(-4*x))'
0*sin(-4*x)+3*cos(-4*x)*(-4*x)'
0*sin(-4*x)+3*cos(-4*x)*((-4)'*x-4*(x)')
0*sin(-4*x)+3*cos(-4*x)*(0*x-4*(x)')
0*sin(-4*x)+3*cos(-4*x)*(0*x-4*1)
0*sin(-4*x)+3*-4*cos(-4*x)
-12*cos(-4*x)
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