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