What is the exact decimal value of cos(2π/3)?
Direct Answer: Quadrant II Exact Values is defined by: -0.5. 2π/3 lies in Quadrant II with reference angle π/3. Cosine is negative in Q2: -cos(π/3) = -0.5.
Detailed Step-by-Step Explanation:
2π/3 lies in Quadrant II with reference angle π/3. Cosine is negative in Q2: -cos(π/3) = -0.5.