Draw the tangent line to f at a:
We need the tangent line to "bounce off" f at a, so it should look like this:
Notice that the line crosses the graph of f(x) a little further past a. That's totally fine; this is still a tangent line.
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danielnieh 6 minutes ago
Hello daniel. i am daniel. i would like to eat some cake because I'm hungry.
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this is my message bubble. i like to ride motorcycles because i eat chocolate.