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The base B C of A B C is fixed and the ...

The base `B C` of ` A B C` is fixed and the vertex `A` moves, satisfying the condition `cot(B/2)+cot(C/2)=2cot(A/2),` then (a) `b+c=a` (b) `b+c=2a` (c) vertex `A` moves along a straight line (d) Vertex `A` moves along an ellipse

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