Calculate the exact value of .

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

Problem

Calculate the exact value of cos⁡105∘\cos105^\circ. (a) −6+24-\dfrac{\sqrt{6}+\sqrt{2}}{4} (b) −6−24-\dfrac{\sqrt{6}-\sqrt{2}}{4} (c) 6−24\dfrac{\sqrt{6}-\sqrt{2}}{4} (d) −22-\dfrac{\sqrt{2}}{2}

Related theory

Browse the problem library