In a , if and , then the value of is equal to. All symbols have their usual meaning…

MATHEMATICS · Single correct · GCSE · Mathematics · Geometry and Measures · Geometry and Measures

Problem

In a △ABC\triangle ABC, if b=(3−1)ab=(\sqrt3-1)a and ∠C=30∘\angle C=30^\circ, then the value of (A−B)(A-B) is equal to. All symbols have their usual meaning in a triangle. (1) 30∘30^\circ (2) 45∘45^\circ (3) 60∘60^\circ (4) 75∘75^\circ

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