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(10*tan(20*x))'The calculation above is a derivative of the function f (x)
(10)'*tan(20*x)+10*(tan(20*x))'
0*tan(20*x)+10*(tan(20*x))'
0*tan(20*x)+10*((20*x)'/((cos(20*x))^2))
0*tan(20*x)+10*(((20)'*x+20*(x)')/((cos(20*x))^2))
0*tan(20*x)+10*((0*x+20*(x)')/((cos(20*x))^2))
0*tan(20*x)+10*((0*x+20*1)/((cos(20*x))^2))
0*tan(20*x)+10*(20/((cos(20*x))^2))
200/((cos(20*x))^2)
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