Q. Which identity is always true?

(A) sin²θ + cos²θ = 1
(B) sin²θ - cos²θ = 1
(C) tan²θ = 1 + cot²θ
(D) sec²θ = tan²θ - 1

✅ Correct Answer: (A) sin²θ + cos²θ = 1

Explanation: This is the fundamental trigonometric identity.

Published by Roshan ⭐ 3.43K Points at 05-Jul-2026 12:25 pm in Math

Explanation by: Roshan

This is the fundamental trigonometric identity.

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