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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The integral of xxx^x from 0 to 2 does not have a simple closed-form solution using elementary funct...
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The move comes as the chicken chain is expected to open more than 150 new stores this year.