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Railways PYQCBT 1 2016

RRB NTPC · Question 49

If 9cosA + 12sinA = 15, find the value of cotA. A. 3/4 B. 12/13 C. 1/3 D. 3/5

  1. A

  2. D

  3. B

  4. C

Show answer & explanation

Answer: (A) A

Explanation

9 cos A + 12 sin A = 15 means 3 cos A + 4 sin A = 5, the maximum value, reached when cos A = 3/5 and sin A = 4/5. So cot A = 3/4.