Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 41
e moving radius, are consid-ered positive ; in the opposite direction, negative. Hence, the signs of the functions for each quadrant are: Sine and cosecant I. II. III. IV. + + — — Cosine and secant + — — + Tangent and cotangent.... + — + — 32 7?.:>;::;vzi?.y §25. Functions of a Vabiable Angle.… … 1. Ttie Sine. In the first quadrant, the sine J/Pinc:from 0 to 1; in the second, it remains positive, and decreasesfrom 1 to 0; in the third, it is negative, and increases in abso-lute value from 0 to 1; in the fourth, it is negative, anddecreases in absolute value from 1 to 0. GONIOMETRY. 33 2.…
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