If, in , , , and , then…

MATHEMATICS · Single correct · A Level · Mathematics · Trigonometry · Trigonometry

Problem

If, in △ABC\triangle ABC, b=3b=\sqrt{3}, c=1c=1, and ∠B−∠C=90∘\angle B-\angle C=90^\circ, then ∠A\angle A is (1) 30∘30^\circ (2) 45∘45^\circ (3) 75∘75^\circ (4) 15∘15^\circ

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