Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 29
B •\ J PyC AM ( A 0 p B Fig. 41 … GONIOMETRY 41 If the terminal line of any angle x extends through thevertex indefinitely both ways, and if the circumference of aunit circle cuts the terminal line at P, the axis of abscissas atA, and the axis of ordinates at B, then sin x = the ordinate of P ; cos x = the abscissa of P ; tan x ==…
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