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...
As my mom was passing out my dad was holding her up against the wall at the hospital, my mom breathe...
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Well, I can only speak for me and I will say 2 in is about as high as I can handle being on my feet...
I do not have or had too many bulls. Hubby and me prefer to have long term relationship with such gu...
If you only knew how many of us have asked this exact same question! It's the reason I found Quora....