∫(sec-¹x + coses-¹x)dx =

  Q-: ∫(sec-¹x + coses-¹x)dx = (A) π/2 + x + k (B) πx/2 + k (C) π/2x + K (D) 0 Answer -: πx/2 + k  Hints-: sec-¹x + coses-¹x = π/2