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(5*(1/tan(x/9)))'The calculation above is a derivative of the function f (x)
(5)'*(1/tan(x/9))+5*(1/tan(x/9))'
0*(1/tan(x/9))+5*(1/tan(x/9))'
0*(1/tan(x/9))+5*(((1)'*tan(x/9)-(1*(tan(x/9))'))/((tan(x/9))^2))
0*(1/tan(x/9))+5*((0*tan(x/9)-(1*(tan(x/9))'))/((tan(x/9))^2))
0*(1/tan(x/9))+5*((0*tan(x/9)-(1*((x/9)'/((cos(x/9))^2))))/((tan(x/9))^2))
0*(1/tan(x/9))+5*((0*tan(x/9)-(1*((((x)'*9-(x*(9)'))/(9^2))/((cos(x/9))^2))))/((tan(x/9))^2))
0*(1/tan(x/9))+5*((0*tan(x/9)-(1*(((1*9-(x*(9)'))/(9^2))/((cos(x/9))^2))))/((tan(x/9))^2))
0*(1/tan(x/9))+5*((0*tan(x/9)-(1*(((1*9-(x*0))/(9^2))/((cos(x/9))^2))))/((tan(x/9))^2))
0*(1/tan(x/9))+5*((0*tan(x/9)-(1*(1/9/((cos(x/9))^2))))/((tan(x/9))^2))
0*(1/tan(x/9))+5*((-1/9*(cos(x/9))^-2)/((tan(x/9))^2))
((-5/9)*(cos(x/9))^-2)/((tan(x/9))^2)
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