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In the video, he divides out a variable as below:

$$r^2=2rsin\theta\\r=2sin\theta$$

When you do a division like this, aren't you dividing out a variable?

What happens if you take the square root of both sides like below?

$$r^2=2rsin\theta\\|r|=\sqrt{2rsin\theta}$$

Would that be more correct?

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# Dividing cancels out a solution?

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