Find the exact value of .

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

Problem

Find the exact value of cos⁡75∘\cos75^{\circ}. (a) 64\dfrac{\sqrt6}{4} (b) 12\dfrac{1}{\sqrt2} (c) 6−24\dfrac{\sqrt6-\sqrt2}{4} (d) 6+24\dfrac{\sqrt6+\sqrt2}{4}

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