f(x) = sec(θ) tan(θ)
f ' (x) = sec(θ)*tan (θ) * tan (θ) + sec(θ)sec^2(θ) = sec(θ) [ tan^2 (θ) + sec^2 (θ) ]
Note : other answers are possible
I have no clue what the answer is. I got a different answer and I put the answer you got in and it still says it's wrong. I'm assuming there must be one way they will take the answer.