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Question: Propriety of an ellipse

Question:Propriety of an ellipse

JAMET 375 Maple 2018
geometry triangle ellipse
September 01 2020
1

In the plane, an ABC triangle is considered for the vertices B and C are fixed, A being variable so that b +c remains constant and equal to a given length l. (b=distance(A,C), (c=distance(A,B)
How to show that the product tan(B/2=*tan(C/2) remains constant ?
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