SubArea: Sine, cosine, tangent and cotangentLevel: AProject ID: 9000032114Accepted: 1Clonable: 0Easy: 1Evaluate \(\cos \left ( \frac{\pi }{6}\right )\).\(\frac{\sqrt{3}} {2} \)\(\frac{\sqrt{2}} {2} \)\(-\frac{1} {2}\)\(-\frac{\sqrt{3}} {2} \)\(0\)\(-\frac{\sqrt{2}} {2} \)
