If cos(θ) = 1/2, what are the possible values of θ in the range [0°, 360°]?

Practice Questions

Q1
If cos(θ) = 1/2, what are the possible values of θ in the range [0°, 360°]?
  1. 60°, 300°
  2. 30°, 150°
  3. 90°, 270°
  4. 0°, 180°

Questions & Step-by-Step Solutions

If cos(θ) = 1/2, what are the possible values of θ in the range [0°, 360°]?
  • Step 1: Understand that cos(θ) = 1/2 means we are looking for angles where the cosine value is 1/2.
  • Step 2: Recall the unit circle and the special angles. The cosine of an angle corresponds to the x-coordinate on the unit circle.
  • Step 3: Identify the angles where cos(θ) = 1/2. These angles are 60° and 300°.
  • Step 4: Check that both angles are within the range of [0°, 360°]. 60° is in the range, and 300° is also in the range.
  • Step 5: Conclude that the possible values of θ are 60° and 300°.
  • Trigonometric Functions – Understanding the values of cosine and their corresponding angles in the unit circle.
  • Inverse Trigonometric Functions – Using the inverse cosine function to find angles that yield a specific cosine value.
  • Angle Measurement – Identifying angles in degrees within a specified range.
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