Question

tan x integration

Answer 1

write tan x as sin x/ cos x

Answer 2

then do a u substitution
u = cos x
du = ... ?

Answer 3

After you make that substitution, and form a new integral in terms of 'u', you can use this formula
\(\Large \int \dfrac{f'(x)}{f(x)}dx = \ln f(x)+c\)

\(\Large \int \dfrac{1}{x}dx = \ln x+c\)

Answer 4

Thanks a lot! (sorry for the unfriendly question, didn't know how the site worked yet haha)

Answer 5

welcome ^_^

and since you're new here,


\(\huge \color{red}{\text{Welcome to Open Study}}\ddot\smile\)

if you have any doubts browsing this site, you can ask me :)

Answer 6

for starters, you can look at this
http://prezi.com/fs3hqdpcopic/an-unofficial-guide-to-openstudy/