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(8*x*tan(2*x))'The calculation above is a derivative of the function f (x)
(8*x)'*tan(2*x)+8*x*(tan(2*x))'
((8)'*x+8*(x)')*tan(2*x)+8*x*(tan(2*x))'
(0*x+8*(x)')*tan(2*x)+8*x*(tan(2*x))'
(0*x+8*1)*tan(2*x)+8*x*(tan(2*x))'
8*tan(2*x)+8*x*(tan(2*x))'
8*tan(2*x)+8*x*((2*x)'/((cos(2*x))^2))
8*tan(2*x)+8*x*(((2)'*x+2*(x)')/((cos(2*x))^2))
8*tan(2*x)+8*x*((0*x+2*(x)')/((cos(2*x))^2))
8*tan(2*x)+8*x*((0*x+2*1)/((cos(2*x))^2))
8*tan(2*x)+8*x*(2/((cos(2*x))^2))
8*tan(2*x)+(16*x)/((cos(2*x))^2)
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