| Samuel Heynes - Trigonometry - 1716 - 132 pages
...the fourth . Lemma, the Co-fines of two Arcs are reciprocally proportional to their Secants. RULE V. **The Tangents of the Bafes are proportional to the Tangents of the** Angle at the Vertex. Hate V. /Tpjrviii. For by the fecund Axiom, T,ZBPA.T,BA(::RS,PA)::T>DPA.T,DA.... | |
| Henry Wilson - Sphere - 1720 - 192 pages
...The Tangents of the Sides, are reciprocally proportional to the Co-fines of the Vertical Angles. 9. **The Tangents of the Bafes, are proportional to the Tangents of the Vertical Angles.** 10. Having let fall the'Perpendicular, as before, it will be as the Sine of the Sum of the Hipothenufes,... | |
| Samuel Heynes - Trigonometry - 1725 - 132 pages
...the fourth Lemma, the Co-fines of two Arcs are reciprocally proportional to their Secants. RULE V. **The Tangents of the Bafes are proportional to the Tangents of the** Angle at the Vertex. Kate V. fig. XV III. For by the fécond Axiom. Т.. .¿БРА : T.BA(: :R:S.PA):... | |
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