Railways PYQCBT 1 2016

RRB NTPC · Question 31

If \(\sin A = \frac{1}{{\sqrt 2 }}\) and \({\mathop{\rm Cos}\nolimits} B = \frac{{\sqrt 3 }}{2}\), then, find the value of (A + B)º. A. 60º B. 75º C. 105º D. 90º

  1. C

  2. A

  3. D

  4. B

Show answer & explanation

Answer: (D) B

Explanation

sin A = 1/√2 gives A = 45°, and cos B = √3/2 gives B = 30°. A + B = 75°.