American Journal of Science, Vol. 1. — Art. XX. An improved Method of obtaining the Formulæ for the Sines and Cosines of the Sum and Difference of two Arcs.

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American Journal of Science, Vol. 1. Art. XX. An improved Method of obtaining the Formulæ for the Sines and Cosines of the Sum and Difference of two Arcs. · ch 118/126

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