Could someone please do me a favor and show me the steps to integrate this problem: 2PI fnInt((x)(-10cos((PI/6.44)x)+18 - 1 ),x,0,0.2)? Thanks.

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- Mar 20th 2013, 08:46 PMknag95Integration By Parts
Could someone please do me a favor and show me the steps to integrate this problem: 2PI fnInt((x)(-10cos((PI/6.44)x)+18 - 1 ),x,0,0.2)? Thanks.

- Mar 21st 2013, 02:36 AMchiroRe: Integration By Parts
Hey knag95.

It is usually a better idea for the person attempting the question to show what they have tried rather than to just be handed the answer. Can you show us what you tried? - Mar 30th 2013, 02:51 PMx3bnmRe: Integration By Parts
We can simplify to write:

Now we know that if and are two functions then:

If we rearrange this we get:

Let and let:

then by integrating both sides:

Now by plugging in appropriate values to Equation(1) we get:

That's the answer. Hope it helps.

You can check the answer at: integrate (2*pi * ((x)(-10 * cos((pi/6.44) * x) +17 ))) dx from x=0 to 0.2 - Wolfram|Alpha