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...
Maybe it's not so harmless.
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Journey through the galaxy while seeing a new scientific discovery.
It's set to erupt in 2025. When exactly, only time will tell.
NEW YORK (Reuters) -The U.S. government's growing debt pile is a "ticking time bomb" and how the Tru...