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(7*cos(3*x)-6*sin(x)-x)'The calculation above is a derivative of the function f (x)
(7*cos(3*x)-6*sin(x))'+(-x)'
(-6*sin(x))'+(7*cos(3*x))'+(-x)'
(-6)'*sin(x)-6*(sin(x))'+(7*cos(3*x))'+(-x)'
0*sin(x)-6*(sin(x))'+(7*cos(3*x))'+(-x)'
0*sin(x)-6*cos(x)+(7*cos(3*x))'+(-x)'
(7)'*cos(3*x)-6*cos(x)+7*(cos(3*x))'+(-x)'
0*cos(3*x)-6*cos(x)+7*(cos(3*x))'+(-x)'
0*cos(3*x)-6*cos(x)+7*-sin(3*x)*(3*x)'+(-x)'
0*cos(3*x)-6*cos(x)+7*-sin(3*x)*((3)'*x+3*(x)')+(-x)'
0*cos(3*x)-6*cos(x)+7*-sin(3*x)*(0*x+3*(x)')+(-x)'
0*cos(3*x)-6*cos(x)+7*-sin(3*x)*(0*x+3*1)+(-x)'
0*cos(3*x)-6*cos(x)+7*3*(-sin(3*x))+(-x)'
0*cos(3*x)-6*cos(x)+7*-3*sin(3*x)+(-x)'
-6*cos(x)-21*sin(3*x)-1
-6*cos(x)-(21*sin(3*x))-1
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