Question

If f(x)= cscxtanx, then f'(x)=?

Answer 1

it might help to recognize that csc(x) = 1/sin(x) and tan(x) = sin(x)/cos(x)

Answer 2

cscx tanx = 1/sin(x) * sin(x) /cos(x) = sec(x)

Answer 3

the product rule works though

Answer 4

you beat me to it:)

Answer 5

sec(x) can be re-written as (cos x)^-1 and derive it using the chain rule.