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(12*sin(3*x+pi/2))'The calculation above is a derivative of the function f (x)
(12)'*sin(3*x+pi/2)+12*(sin(3*x+pi/2))'
0*sin(3*x+pi/2)+12*(sin(3*x+pi/2))'
0*sin(3*x+pi/2)+12*cos(3*x+pi/2)*(3*x+pi/2)'
0*sin(3*x+pi/2)+12*cos(3*x+pi/2)*((3*x)'+(pi/2)')
0*sin(3*x+pi/2)+12*cos(3*x+pi/2)*(3*(x)'+(3)'*x+(pi/2)')
0*sin(3*x+pi/2)+12*cos(3*x+pi/2)*(3*(x)'+0*x+(pi/2)')
0*sin(3*x+pi/2)+12*cos(3*x+pi/2)*(0*x+(pi/2)'+3*1)
0*sin(3*x+pi/2)+12*3*cos(3*x+pi/2)
36*cos(3*x+pi/2)
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