To calculate exactly using special angles

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

Problem

To calculate cos⁡15∘\cos 15^{\circ} exactly using special angles, which of the following decompositions is the most suitable? (a) 45∘+30∘45^{\circ}+30^{\circ} (b) 90∘−45∘90^{\circ}-45^{\circ} (c) 45∘−30∘45^{\circ}-30^{\circ} (d) 60∘+45∘60^{\circ}+45^{\circ}

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