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Railways PYQCBT 1 2016

RRB NTPC · Question 42

If tanA + cotA = 2, then tan3A + cot3A = ? A. –(2) B. 1 C. 0 D. 3

  1. A

  2. B

  3. C

  4. D

Show answer & explanation

Answer: (A) A

Explanation

tan A + cot A = 2 holds only when tan A = cot A = 1. Then tan³A + cot³A = 1 + 1 = 2.