- #1
manenbu
- 103
- 0
Homework Statement
calculate:
[tex]\oint \frac{2-y}{x^2+(y-2)^2} dx + \frac{x}{x^2+(y-2)^2} dy [/tex]
where [itex] y = \sin{t} + 2, x = \cos{t}, 0 \leq t \leq \pi[/itex]
Homework Equations
Green's Theorem.
The Attempt at a Solution
In what order should I do everything?
I need to find the derivaties of P and Q (what comes before the dx and dy), and doing it like this is a bit complicated. So I thought I'll change it to polar, but then I need to take dP/dy but now P is a function of t and not x,y so I can't do that.
In that case, how do I convert dy to polar differentials? I know that dA or dxdy equals rdrdt, but what about only dy?
Or another idea I thought of was to make the denominator 1 (because it is - it's cos2t + sin2t, and then take the derivatives but they are different than what I get if I don't do that.
I don't know which method would be correct, so if someone can help me that'd be great.