Question

[AP Cal] Evaluate the following definite integral

Answer 1

\[\int\limits_{0}^{\frac{ \pi }{ 6 }}\cos 3xdx\]

Answer 2

put 3x=t

Answer 3

do you really need to use substitution here O_O?

Answer 4

oh nvm me hes right

Answer 5

so do i use substitution method?

Answer 6

yes ys

Answer 7

3x=t
3dx=dt
dx=dt/3

that makes it

1/3 x cost dt

Answer 8

okay, i set 3x = u, now?

Answer 9

see above

Answer 10

where is the x before cost coming from?

Answer 11

thst is mltiply