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((1/5)*cos(6*x)-((1/4)*sin(6*t)))'The calculation above is a derivative of the function f (x)
((1/5)*cos(6*x))'+(-((1/4)*sin(6*t)))'
(1/5)'*cos(6*x)+(1/5)*(cos(6*x))'+(-((1/4)*sin(6*t)))'
0*cos(6*x)+(1/5)*(cos(6*x))'+(-((1/4)*sin(6*t)))'
0*cos(6*x)+(1/5)*-sin(6*x)*(6*x)'+(-((1/4)*sin(6*t)))'
0*cos(6*x)+(1/5)*-sin(6*x)*((6)'*x+6*(x)')+(-((1/4)*sin(6*t)))'
0*cos(6*x)+(1/5)*-sin(6*x)*(0*x+6*(x)')+(-((1/4)*sin(6*t)))'
0*cos(6*x)+(1/5)*-sin(6*x)*(0*x+6*1)+(-((1/4)*sin(6*t)))'
0*cos(6*x)+(1/5)*6*(-sin(6*x))+(-((1/4)*sin(6*t)))'
0*cos(6*x)+(1/5)*-6*sin(6*x)+(-((1/4)*sin(6*t)))'
(-6/5)*sin(6*x)
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