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Geometrical Proof of tan A + tan B + tan C = tan A tan B tan C
Published online by Cambridge University Press: 31 October 2008
Extract
Let ABC be the Δ, AD ⊥ to BC produced to meet circumcircle in K, BL a diameter of circumcircle, LM ⊥ to AK. Let BK, KG, CL and LA be joined.
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- Copyright © Edinburgh Mathematical Society 1916