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...
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Thanks for asking. I have had couple of threesomes FMF ones only. But I have huge fantasy of me bein...
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Boy, could I write a book on the ways and how much I wish they did. Reading through these stories, I...