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Railways PYQCBT 1 2016

RRB NTPC · Question 46

The value of tan(–405°) is : A. 1 B. –1 C. ∞ D. 0

  1. D

  2. B

  3. A

  4. C

Show answer & explanation

Answer: (B) B

Explanation

tan is an odd function, so tan(−405°) = −tan 405°. Since tan repeats every 180°, tan 405° = tan(405° − 360°) = tan 45° = 1. So tan(−405°) = −1.