Answer: [-1,1].
- A [0,1]
- B [-1,1]
- C [-π/2, π/2]
- D [0, 2π]
Correct answer: B. [-1,1]
Explanation: sin x ranges from -1 to 1 inclusive for all real x.
Unit circle with standard angles 0, 30, 45, 60, 90 degrees; at 45 degrees the point is (cos45, sin45) = (1/sqrt2, 1/sqrt2).
Concept context
Ratios, identities, and applications in triangles