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(15*x*sin(3*x))'The calculation above is a derivative of the function f (x)
(15*x)'*sin(3*x)+15*x*(sin(3*x))'
((15)'*x+15*(x)')*sin(3*x)+15*x*(sin(3*x))'
(0*x+15*(x)')*sin(3*x)+15*x*(sin(3*x))'
(0*x+15*1)*sin(3*x)+15*x*(sin(3*x))'
15*sin(3*x)+15*x*(sin(3*x))'
15*sin(3*x)+15*x*cos(3*x)*(3*x)'
15*sin(3*x)+15*x*cos(3*x)*((3)'*x+3*(x)')
15*sin(3*x)+15*x*cos(3*x)*(0*x+3*(x)')
15*sin(3*x)+15*x*cos(3*x)*(0*x+3*1)
15*sin(3*x)+15*x*3*cos(3*x)
15*sin(3*x)+45*x*cos(3*x)
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