SubArea: Sine, cosine, tangent and cotangentLevel: AProject ID: 9000032105Accepted: 1Clonable: 0Easy: 1Evaluate \(\cos \left ( \frac{\pi }{2}\right )\).\(0\)\(- 1\)\(\frac{\sqrt{3}} {3} \)\(\sqrt{3}\)\(1\)\(-\frac{\sqrt{3}} {3} \)
