Question

Trig. Sub?

Answer 1

\[\int\limits_{}^{} \frac{ \sqrt{x^2-9}}{ x} dx\]

Answer 2

you're trying
\(\Large x = 3 \sec u\)
?
worth a shot

Answer 3

Here's what I tried to do
\[x^2-9=9sec^{2}\theta-9=9tan^{2}\theta\]

Answer 4

\(x=3sec^{2}\theta\)

Answer 5

not sec^2
you've tried
x= 3 sec thetha

Answer 6

\[\int\limits_{}^{}\frac{ \sqrt{9\tan^{2}\theta} }{ 3\tan\theta }*3\sec^{2}\theta~dx\]

Answer 7

Oh my bad, i meant \(x=3sec\theta\)

Answer 8

so denominator would be 2 sec thetha, roight ?

Answer 9

*3 sec thetha**

Answer 10

Oh, makes sense ! >.<
THanks @hartnn
this mistake was small but ughhhh

Answer 11

also be careful with your derivatives :)

Answer 12

Yes! :)