Calculus Question

Question

Find the derivative of the function

show rules used if possible

f(x) = 4/ (11x - tanx)

Answer 1

f(x)=4(11x-tan(x))^-1

f '(x)=-4(11x-tan(x))^-2(11-sec²(x)) --> Chain run

f '(x)=4(sec²(x)-11)/(11x-tan(x))² -->simplify