Related rates; walking with shadow

The shadow problem is pretty well worked out in the link below.  See if you can catch the sloppy mistake in the last 20 sec. of the video.

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About mrsiderer

I am am a mechanical engineer and a math and physics teacher. I like to understand the way things work, to know about new things that are being developed, and to understand how math impacts everything. I value my time and yours and will only post quality material.
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