Let's say I've got a graph
describing Coolmath's revenue...
(fictional!)
Let's plop some tangent lines in
there:
It's pretty clear that the tangent
lines with positive slopes are good (yea - profits are going up)...
and tangent lines with negative slopes are bad (boo - profits are
going down.)
So, slopes of tangent lines can
tell us where a graph is increasing or decreasing.
But, we can use tangent lines to
tell us even more than that.
Continued on the
next
page
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