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...
There is a very ancient saying that says: The ONLY way two people can successfully keep a secret is...
Rock With You - Michael Jackson Why You Wanna Treat Me So Bad? - Prince You Are The Sunshine Of My L...
My first wife loved dogging in parks and rest areas but we lived where there were no theaters or eve...
I currently feel good in this one. It's halter neck top with a bare back. I'm wearing some pleather...
If I really care about you and you are really important to me, then I care about your opinion, and y...
Not I, but my former neighbor. Their son had been working hard, going to school and then going to wo...
I feel equal measures anger and pity. I feel angry about how dumb so many Americans are. How blind,...
In the USA, people’s online activities are affairs protected from criminal prosecution by the First...
In 2004, I’d had a smoker’s cough for two or three years, even though I’d never smoked. When my daug...
Heterosexual men may want to be the bottom. Most women I've been with either love it or hate. Thares...
Neighbors never try to tell me what to do because I’m crazy as hell. This busybody one next door, wh...