Problem:

Attempt:

Quote:

u =

du =

v =

dv =

Focusing on

Quote:

u =

du =

v =

dv =

Focusing on

Put everything back together

Answer:

Correct Answer:

Where did I go wrong?

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- May 2nd 2009, 03:46 PMFallen186Integral of e^(-3x)*cos(x) dx
**Problem:**

**Attempt:**

Quote:

u =

du =

v =

dv =

Focusing on

Quote:

u =

du =

v =

dv =

Focusing on

Put everything back together

**Answer:**

**Correct Answer:**

Where did I go wrong? - May 2nd 2009, 04:12 PMchengbin

Integrating sinx becomes -cosx, not cosx.

I tried this problem, and I made a mistake somewhere because I got

- May 2nd 2009, 04:17 PMFallen186
- May 3rd 2009, 12:53 AMMoo
Hello,

Another method :

And

Hence

What's good with this is that there is no need to integrate cos or sin, and mess up with the signs :D

In the first quote :

Quote:

u = cos(x)

du = sin(x) dx

- May 3rd 2009, 10:58 AMFallen186
How do you box your answer?

- May 3rd 2009, 11:53 AMderfleurer
\boxed{ CONTENT }

You can always quote a post to take a look at its contents (or click the latex image).