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OpenStudy (anonymous):
find the area of the region inside both r = 7sin(theta) and 7sin(2theta) in the first quadrant
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OpenStudy (anonymous):
You integrate with respect to theta.
OpenStudy (anonymous):
I think it is something like \[ \int _{\theta_1}^{\theta_2} \frac12\left[r(\theta)\right]^2~d\theta \]
OpenStudy (anonymous):
the limit of integration is what I have difficult with
OpenStudy (anonymous):
I think there will be two integrals
OpenStudy (anonymous):
You have to figure out which \(r\) is greater.
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OpenStudy (anonymous):
\[ 7\sin(2\theta) = 14\sin(\theta)\cos(\theta) \]
OpenStudy (anonymous):
\[ 14\sin(\theta)\cos(\theta) - 7\sin(\theta) = 0\\ 7\sin(\theta)(2\cos(\theta)-1) = 0 \]
OpenStudy (anonymous):
|dw:1418006519275:dw|
OpenStudy (anonymous):
Ok, I got one solution to be pi/3
OpenStudy (anonymous):
The bounds are going to be \(0\to\pi/2\) But at \(\pi/3\), we need to do a switch?
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OpenStudy (anonymous):
|dw:1418006827678:dw|
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