Schmall, Charles Nelson. [from old catalog] · New York, D. Van Nostrand company · leaf 75
ber of the normal form may bepositive. Note 1. — Observe that the fractional coefficients of a: and y abovemay be assumed to be the cosine and sine respectively of some angle,since the sum of their squares is equal to unity. 58 ANALYTICAL GEOMETRY Note 2.—The generality of the proof of the normal…
Geometry, Analytic
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