Allan B. Magruder died in 1822.
Allan B. Magruder was born in 1775.
Allan B. Calhamer was born in 1931.
Allan B. Walsh died on 1953-08-05.
Allan B. Walsh was born on 1874-08-29.
Allan B. Crawford has written: 'I went to Tristan' -- subject(s): Description and travel
R. A. B. Allan has written: 'Project work in mathematical studies (for students aged 16-18)'
P. B. M. Allan has written: 'The book-hunter at home' -- subject(s): Book collecting
B. Allan Quigley has written: 'Rethinking Literacy Education' -- subject(s): Literacy, Adult education, Language arts
Allan B. Colombo has written: 'The best of kinks & hints' -- subject(s): Miscellanea, Buildings, Security measures, Fire alarms
Allan B. Wolfson has written: 'Harwood-Nuss' clinical practice of emergency medicine' -- subject(s): Emergencies, Emergency medicine, Emergency Medicine
Your question is kind of confusing, but if you're asking what the angle between two unit vectors A and B is, then the answer is: the inverse cosine of the dot products of A and B.