Subject: [HM] origin of trigonometric identities
From: Todd Timmons (ttimmons@systema.westark.edu)
Date: Mon May 15 2000 - 14:09:23 EDT
Dear all,
Does anyone know the origin of the sum and difference of angles
identities,. i.e., sin(A+/-B) and cos(A+/-B)? In an article in the
American Journal of Science and Arts (1819), American mathematician
Theodore Strong gives "an improved method of obtaining" these
formulas, but it is not clear if the formulas are new or just his
method of deriving the formulas.
Thanks
Todd Timmons
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Todd Timmons
Westark College
5210 Grand Ave.
Box 3649
Fort Smith, AR 72913-3649
501-788-7630
ttimmons@systema.westark.edu
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