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(cos(8*x)*cos(3*x))'The calculation above is a derivative of the function f (x)
(cos(8*x))'*cos(3*x)+cos(8*x)*(cos(3*x))'
cos(8*x)*(cos(3*x))'-sin(8*x)*(8*x)'*cos(3*x)
cos(8*x)*(cos(3*x))'-sin(8*x)*((8)'*x+8*(x)')*cos(3*x)
cos(8*x)*(cos(3*x))'-sin(8*x)*(0*x+8*(x)')*cos(3*x)
cos(8*x)*(cos(3*x))'-sin(8*x)*(0*x+8*1)*cos(3*x)
8*(-sin(8*x))*cos(3*x)+cos(8*x)*(cos(3*x))'
cos(8*x)*(cos(3*x))'-8*sin(8*x)*cos(3*x)
cos(8*x)*-sin(3*x)*(3*x)'-8*sin(8*x)*cos(3*x)
cos(8*x)*-sin(3*x)*((3)'*x+3*(x)')-8*sin(8*x)*cos(3*x)
cos(8*x)*-sin(3*x)*(0*x+3*(x)')-8*sin(8*x)*cos(3*x)
cos(8*x)*-sin(3*x)*(0*x+3*1)-8*sin(8*x)*cos(3*x)
cos(8*x)*3*(-sin(3*x))-8*sin(8*x)*cos(3*x)
cos(8*x)*-3*sin(3*x)-8*sin(8*x)*cos(3*x)
-8*sin(8*x)*cos(3*x)-(3*cos(8*x)*sin(3*x))
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