Sitting in your sailboat looking at the horizon, you see a lighthouse 500 feet away. Looking up at a , you see the light at the
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Hope this helps! I'm sorry for worse handwriting.
Let and
. By the product rule,
By the power rule, we have and
, but
are functions of
, so we also need to apply the chain rule:
and we have
So we end up with
Replace to get everything in terms of
:
We can simplify this by factoring: