Q. Which of the following is equal to cos²θ − sin²θ?

  • (A) cos 2θ
  • (B) sin 2θ
  • (C) tan 2θ
  • (D) sec 2θ
✅ Correct Answer: (A) cos 2θ
Explanation: cos 2θ = cos²θ − sin²θ.

Published by Roshan ⭐ 3.43K Points at 05-Jul-2026 01:40 pm in Math

Explanation by: Roshan
cos 2θ = cos²θ − sin²θ.

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