Question

Could anyone please help me solve this derivative problem?

Answer 1

have you tried using quotient rule?

Answer 2

Yes and I get stuck after I get tan(3x)'(x^2)-tan(3x)(x^2)'/(x^2)^2

Answer 3

well what's the derivative of tan(3x)?

Answer 4

if (tanx)' = (sec(x))^2, then (tan(3x))' = ?
(apply the chain rule)