Calculate the exact value of .

MATHEMATICS · Single correct · CBSE · Mathematics · Introduction to Trigonometry · Introduction to Trigonometry

Problem

Calculate the exact value of cos⁡765∘\cos 765^{\circ}. (a) 12\dfrac{1}{2} (b) 22\dfrac{\sqrt{2}}{2} (c) −22-\dfrac{\sqrt{2}}{2} (d) 32\dfrac{\sqrt{3}}{2}

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