Help me confirm my answer!

Question

anonymous · Answer

Dragon ball z!!!

anonymous · Answer

Question: $$\int\limits_{}^{}\sqrt{9x ^{2}-1}dx$$

anonymous · Answer

whats ur answer?

anonymous · Answer

Answer: $$(1/6)(\sec \theta \tan \theta+\ln(\sec \theta \tan \theta))-(1/3)(\ln(\sec \theta \tan \theta))$$

anonymous · Answer

to confirm your answer you need to the find the derivative of your answer.if it matches the question, you're right

anonymous · Answer

I don't have to convert back to x so taking the derivative will not suffice

anonymous · Answer

Then, someone will have to check your work

anonymous · Answer

take the derivative of that then convert it back to x i suppose. i honestly cant read it so i cant check it

anonymous · Answer

did you change this to polar coordinates?

anonymous · Answer

No

anonymous · Answer

i think he did trig subs

anonymous · Answer

Yea

anonymous · Answer

Using a right triangle I did trig. Subs.

anonymous · Answer

gotcha.

anonymous · Answer

And then it turns into like a double integral where you have to do it by parts and all this other garbage.

anonymous · Answer

Really not worth typing cause it will probably be too long for others to take the time to work out lol

anonymous · Answer

Not easy doing with polar coordinate either, just gotta stick with trig sub