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Railways PYQCBT 1 2016

RRB NTPC · Question 3

What is Sin θ tan θ - sec θ ? A. -cos θ B. 1 C. -sec θ D. cosec θ

  1. A

  2. C

  3. B

  4. D

Show answer & explanation

Answer: (A) A

Explanation

sin θ tan θ − sec θ = sin²θ/cos θ − 1/cos θ = (sin²θ − 1)/cos θ = −cos²θ/cos θ = −cos θ.