- #1
tolove
- 164
- 1
Find the area of the following region:
Inside: r2 = 6 cos 2θ
Outside: r = √3
Here's how I've set up the integral. I have to be making a mistake somewhere in the set up, but I can't figure it out.
r1 = √3
r2 = [itex](\sqrt{6 cos 2θ})[/itex]
[itex]\frac{Area}{4}[/itex]= [itex]\frac{1}{2}\int\ (\sqrt{6 cos 2θ})^{2} - \sqrt{3}^{2} dθ [/itex], Evaluated on θ = 0 .. [itex]\frac{π}{4}[/itex]
This is wrong, however. 3√3 - π is the correct solution to this problem. (If this is the correct setup, let me know and I'll post the steps to how I'm incorrectly solving it for help there.)
Also, the second thing I need help with, a frustrating integral:
6[itex]\int \frac{1}{(1+cos θ)^{2} } \sqrt{2 + 2cos θ} dθ[/itex]
Any hints on this? Thank you very much for reading!
Inside: r2 = 6 cos 2θ
Outside: r = √3
Here's how I've set up the integral. I have to be making a mistake somewhere in the set up, but I can't figure it out.
r1 = √3
r2 = [itex](\sqrt{6 cos 2θ})[/itex]
[itex]\frac{Area}{4}[/itex]= [itex]\frac{1}{2}\int\ (\sqrt{6 cos 2θ})^{2} - \sqrt{3}^{2} dθ [/itex], Evaluated on θ = 0 .. [itex]\frac{π}{4}[/itex]
This is wrong, however. 3√3 - π is the correct solution to this problem. (If this is the correct setup, let me know and I'll post the steps to how I'm incorrectly solving it for help there.)
Also, the second thing I need help with, a frustrating integral:
6[itex]\int \frac{1}{(1+cos θ)^{2} } \sqrt{2 + 2cos θ} dθ[/itex]
Any hints on this? Thank you very much for reading!