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(3*(tan(x/2))^3)'The calculation above is a derivative of the function f (x)
(3)'*(tan(x/2))^3+3*((tan(x/2))^3)'
0*(tan(x/2))^3+3*((tan(x/2))^3)'
0*(tan(x/2))^3+3*3*(tan(x/2))^(3-1)*(tan(x/2))'
0*(tan(x/2))^3+3*3*(tan(x/2))^(3-1)*((x/2)'/((cos(x/2))^2))
0*(tan(x/2))^3+3*3*(tan(x/2))^(3-1)*((((x)'*2-(x*(2)'))/(2^2))/((cos(x/2))^2))
0*(tan(x/2))^3+3*3*(tan(x/2))^(3-1)*(((1*2-(x*(2)'))/(2^2))/((cos(x/2))^2))
0*(tan(x/2))^3+3*3*(tan(x/2))^(3-1)*(((1*2-(x*0))/(2^2))/((cos(x/2))^2))
0*(tan(x/2))^3+3*3*(tan(x/2))^(3-1)*(1/2/((cos(x/2))^2))
0*(tan(x/2))^3+3*((3/2*(tan(x/2))^2)/((cos(x/2))^2))
((9/2)*(tan(x/2))^2)/((cos(x/2))^2)
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