Analytic geometry, for technical schools and colleges (1897)
Lambert, Preston Albert, 1862-1925 · New York, Macmillan · leaf 194
ITU Akt. 91. Let X — acos « Angle hetwkex Two Stuaigux Lines X y-b ^z~ccos (i cos y if cos /8 cos a cos li cos ybe the straight lines. The angle between the lines is by definitionthe angle between parallels tothe lines through the origin.Let OM and OM be theseparallels through the origin.From any… … = -cos a -|-—cosr y + -C0Sy7 that cos 0 = cos a COS a + cos /3 cos (3 + cos y cos y. (1) * The sum of the projections ofthe parts of a broken line on anystraight Hne is the part of the lineincluded between the projections oftlie extremities of the broken line.a!) is the projection of AB ; be is…
Geometry, Analytic
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