Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 47
e angles given : (i.) tan 90° = oo. (iii.) cot 270° = 0. (ii.) cos 180° = -1. (iv.) csc3G0° = -oo. 20. Find the values of sin 450°, tan 540°, cos 630°, cot 720°,sin 810°, esc 900°. 21. For what angle in each quadrant are the absolute valuesof the sine and cosine alike ? Compute the values of the… … § 28. Reduction of Functions to the First Quadrant. In a unit circle (Fig. 25) draw two diameters PP and QS equally inclined to the horizon-tal diameter A A, or so that theangles AOP, AOQ, AOP, andAOS shall be equal. From thepoints P, Q, P, S let fall per-pendiculars to AA; the fourright triangles…
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