Legendre, A. M. (Adrien Marie), 1752-1833, Brewster, David, Sir, 1781-1868, Davies, Charles, 1798-1876 · New York, Wiley & Long · leaf 222
222 PLANE TRIGONOMETRY. … XVI. The square of the sinecf an arc, together ivith thesquare of the cosine, is equalto the square of the radius ; sothat in general terms we havesin^A + cos^A^Rl This property results im-mediately from the right-an-gled triangle CMP, in whichMP-+CP^=CM. It follows that w^hen thesine of an arc is…
Trigonometry · Geometry
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