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eb0057add1eeab287040c90821388015155a7fb1: $$
\color{NavyBlue} \hat{\mathbf{n}}
938ca7f578fab7db72fe7ce5bd76683189e3b07a: $$
A
1f2a551d7b8a7990afa33a67d048ce13c1e3a4cc: $$
\color{red} \mathbf{v}_B