Woods, Frederick S. (Frederick Shenstone), 1864-, Bailey, Frederick H. (Frederick Harold), 1865- · Boston, New York [etc.] Ginn and Company · leaf 77
60 THE ST11A1G1IT LINE point P on the terminal line of <f> and drop the perpendicularJ//, we have, in the two cases represented by figs. 66 and 67, tan (/> MPLM MP … But —— is equal to the slope of theLM line, by (2), § 6. Thereforetan d> = m. If the straight line is parallel toOY, (/> = 90° and tan <f> = oo. If theline is parallel to OX, no angle <f> is formed, but since m = 0, we may say tan <f> = 0 ; whence<£ = 0° or 180°. 2.…
Geometry, Analytic · Calculus
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