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.
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