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