A Level

MATHEMATICS · Subjective · A Level · Mathematics · Trigonometry · Trigonometry

Problem

Show that sin⁡47∘+sin⁡61∘−sin⁡11∘−sin⁡25∘=cos⁡7∘\sin 47^\circ + \sin 61^\circ - \sin 11^\circ - \sin 25^\circ = \cos 7^\circ .

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