Identify the pair of angles for which .

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

Problem

Identify the pair of angles for which sin⁡α+sin⁡β=0\sin\alpha+\sin\beta=0. (a) 45∘, 135∘45^{\circ},\,135^{\circ} (b) 45∘, −45∘45^{\circ},\,-45^{\circ} (c) 30∘, 150∘30^{\circ},\,150^{\circ} (d) 90∘, 180∘90^{\circ},\,180^{\circ}

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