Schmall, Charles Nelson. [from old catalog] · New York, D. Van Nostrand company · leaf 53
Fig. 45. Discussion.—The curve cuts the x-axis at intervals of 180°, sinceat these intervals sin x = 0, It extends without limit on both sides of theorigin, since an angle may have any magnitude positive or negative.The ordinate has its maximum values alternately + 1 and — 1. Thepositive value… … Fig. 46. Ex. 19. Plot the curve y = tanx. X y 0° 0.00 10° ■ .18 20° .36 30° .58 40° .84 50° 1.19 60° 1.73 70° 2.75 80° 5.67 90° 00 -10° -.18 -20° -.36 etc. etc. Discussiox. — The curve cuts the a>axis at intervals of tt ; 1 e., a-j- 2 TT, -I- o TT, etc. It is discontinuous at intervals of tt ;…
Geometry, Analytic
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