Is there a type of function where every point has exactly one tangent line passing through it? If yes, what is this type of function called?

Eg a parabola y=x² Jesus, of course, spoke in parabolas. In those days it was like the Beatles at Sh...
Eg a parabola y=x² Jesus, of course, spoke in parabolas. In those days it was like the Beatles at Sh...
This one is easy to answer. You gave him everything. That is what he was after. When he approached y...
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Nope! That's a fucking lie that spread by some bitch that probably want some gorgeous guys herself....