A surveyor measures angle of elevation on a mountain to be 15 degrees the ponit on the mountain is horizontally 6 miles away fro
2 answers:
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Assuming the function is
For
to be differentiable, it necessarily has to be continuous. For this condition to be met, we need
For the derivative to exist, the one-sided limits of the derivative must also exist and be equal. We have
Now we solve for
and 
:
For
For the derivative to exist, the one-sided limits of the derivative must also exist and be equal. We have
Now we solve for