CBSE

MATHEMATICS · Single correct · CBSE · Mathematics · Trigonometric Functions · Trigonometric Functions

Problem

Simplify cos⁡13∘cos⁡17∘−sin⁡13∘sin⁡17∘\cos 13^{\circ}\cos 17^{\circ}-\sin 13^{\circ}\sin 17^{\circ}. (a) 22\dfrac{\sqrt{2}}{2} (b) −32-\dfrac{\sqrt{3}}{2} (c) 32\dfrac{\sqrt{3}}{2} (d) 12\dfrac{1}{2}

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