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  9. Q39

RRB Group D (Level-1 posts) 2022 · Question 39 of 598

Express sin θ in terms of cot θ, where θ is an acute angle.

  1. A1⁄√(1 + cot2θ)Correct
  2. B√(1 + cot2θ)
  3. C1⁄(1 + cot2θ)
  4. D1 + cot2θ

Answer: A. 1⁄√(1 + cot2θ)

Explanation

Using the trigonometric identity sin2θ + cos2θ = 1 and cot θ = cos θ/sin θ, we can express sin θ in terms of cot θ as 1/√(1 + cot2θ).

Source: RRB Group D 2022 Prev. Yr. Paper (17 Aug 2022) (Shift 1) - FreshersNow · reliable-secondary

← Q38View full paper (598 questions)Q40 →

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