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(tan(3*x-(4*y)))'The calculation above is a derivative of the function f (x)
(3*x-(4*y))'/((cos(3*x-(4*y)))^2)
((3*x)'+(-(4*y))')/((cos(3*x-(4*y)))^2)
(3*(x)'+(-(4*y))'+(3)'*x)/((cos(3*x-(4*y)))^2)
(3*(x)'+(-(4*y))'+0*x)/((cos(3*x-(4*y)))^2)
((-(4*y))'+0*x+3*1)/((cos(3*x-(4*y)))^2)
3/((cos(3*x-(4*y)))^2)
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