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