Given that $ \cos \left(15^{\circ}\right)=\frac{\sqrt{2+\sqrt{3}}}{2} $ , find an exact expression for $ \cos 165^{\circ} $.

Name: Given that $ \cos \left(15^{\circ}\right)=\frac{\sqrt{2+\sqrt{3}}}{2} $ , find an exact expression for $ \cos 165^{\circ} $.
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Question

Given that  $ \cos \left(15^{\circ}\right)=\frac{\sqrt{2+\sqrt{3}}}{2} $ , find an exact expression for  $ \cos 165^{\circ} $.

Quizplus · Accepted Answer

The Answer of Given that  $ \cos \left(15^{\circ}\right)=\frac{\sqrt{2+\sqrt{3}}}{2} $ , find an exact expression for  $ \cos 165^{\circ} $.

Given That cos⁡(15∘)=2+32 \cos \left(15^{\circ}\right)=\frac{\sqrt{2+\sqrt{3}}}{2} cos(15∘)=22+3​​​ , Find an Exact Expression For

Given That $\cos \left(15^{\circ}\right)=\frac{\sqrt{2+\sqrt{3}}}{2}$ , Find an Exact Expression For