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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I can give you many reasons 1. Men don’t want to be a retirement plan of a weasel. Unsurprisingly,...
It looks like you are addressing the mentally challenged .Any western tourist wih the financial mean...
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CNN will turn a live telecast of 'Good Night and Good Luck' into an evening long event with special...