Railways PYQCBT 2 2017

RRB NTPC · प्रश्न 39

यदि Cot \(x = \frac{5}{12},\) है तो Sin \(x + \frac{1}{Cot \ x} + sec \ x \ = \ ?\)

  1. 173 / 13

  2. 77 / 13

  3. 75 / 13

  4. 17 / 13

उत्तर देखें और व्याख्या

उत्तर: (B) 77 / 13

व्याख्या

cot x = 5/12 gives a 5–12–13 triangle: sin x = 12/13, tan x = 1/cot x = 12/5 and sec x = 13/5. Sum = 12/13 + 12/5 + 13/5 = 12/13 + 5 = 77/13.