Question

Help on solving integrals by substitution?

Answer 1

There are no numbers where the question marks are

Answer 2

Do you know the basic steps for substitution?
Like finding a u and the du?

Answer 3

Yeah U is sin x, correct?

Answer 4

cos x = du?

Answer 5

or.. cosx dx = du

Answer 6

try u = cosx

Answer 7

for u sub, always use on what's on the inside

Answer 8

Then what do i do with the negative sign? Where could I add it?

Answer 9

batman

Answer 10

for u

Answer 11

bring it out bring it out bring it out

Answer 12

So many people.. but if you put u as sin, it wouldn't work.

Because in order for that you need a cosx, but all you have is a \(\Large \frac{1}{\sqrt{cosx}} \)

Answer 13

\[u = cosx \implies du/dx = - sinx \implies du/-sinx = dx\] you can see all the cancellations and stuff

Answer 14

Oh so becasue of the sqrt, I can't use sin x as u?

Answer 15

If you let u sinx, there's no way you'd get square root cosx for its derivative

Answer 16

im a mathlete

Answer 17

maybe this is more clear, try finishing it off