Math Is Fun Forum
  Discussion about math, puzzles, games and fun.   Useful symbols: √ ∞ ≠ ≤ ≥ ≈ ⇒ ∈ Δ θ ∴ ∑ ∫ π -

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Topic review (newest first)

bobbym
2013-06-23 04:43:18

See the sin(x) dx? Well you have du = - sin(x) dx and u = cos(x)

You get -du/u, which you can certainly integrate.

Agnishom
2013-06-23 04:39:54

I think I can do it now.
I will try the next time I wake up

bobbym
2013-06-23 04:29:58

Because you are already done! Look at the numerator and what du equals.

zetafunc.
2013-06-23 04:29:20

Are you familiar with integration by substitution?

Agnishom
2013-06-23 04:28:51

But why are you doing this?
I wanted an interation of it

bobbym
2013-06-23 04:22:30

du = - sin(x) dx

Agnishom
2013-06-23 04:18:56

I am lost.

What technique should I use?

bobbym
2013-06-23 04:15:19

That is the first step. Set u = cos(x)

Agnishom
2013-06-23 04:13:06

zetafunc. wrote:

Write tan(x) = sin(x)/cos(x).

Then?
Please continue

zetafunc.
2013-06-23 04:10:24

Write tan(x) = sin(x)/cos(x).

bobbym
2013-06-23 04:08:26

I use a package or a table.

Agnishom
2013-06-23 04:06:50

Ha ha ha! So, thats called the chain rule!

Achchha, how do I integrate tan(x) by hand?

bobbym
2013-06-23 04:04:51

I mean about the chain rule. You did it!

Agnishom
2013-06-23 04:03:46

Math is Fun. I am not sure if it is funny

bobbym
2013-06-23 03:58:41

That was funny, right?

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