Schmall, Charles Nelson. [from old catalog] · New York, D. Van Nostrand company · leaf 52
?,5 If X = CO , y = CO ; the curve therefore extends to the right of the y axiswithout hmit. Again ; for every value of x there are two equal aud opposite valuesof y ; the curve is therefore symmetrical with regard to the x-axis. Ex. 18. Trace the curve, y = sin x. X (in degrees). y X y 0° 0.00… … 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…
Geometry, Analytic
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