Is it true that ##t=n\times b##?

[DeadOriginal]

I know that for the tangent unit vector $t$, normal unit vector $n$, and binormal unit vector $b$ that $b=t\times n$ and $n=b\times t$. Is it true that $t=n\times b$?

**Edit** Ah! Yes it is. Nevermind. I should have known this was true.

 

[Simon Bridge]

The trick is to prove it though ;)