MCAT Math Question 8: Answer and Explanation

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Test Information

Question: 8

8. What is the minimum value of 2 cosθ - 1?

  • A. -3
  • B. -2
  • C. -1
  • D. 0

Correct Answer: A

Explanation:

The minimum value of the cosine function is ?1 (cos 180° = ?1). Therefore, the minimum value of 2 cos θ – 1 is 2 × (?1) ?1 = ?3.

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