Encyclopaedia Britannica, 11th Edition, "Cincinnatus" to "Cleruchy", Volume 6, Slice 4Note 4 — VOLUME VI SLICE IV Cincinnatus to CleruchyReading editionIn modern trigonometrical notation, 1 + sec θ:tan θ::1:tan ½θ.◇Copy noteReturn to VOLUME VI SLICE IV Cincinnatus to Cleruchy