Ответ:

  1. arctg(−1) − arctg 1 = −π/4 − π/4 = −π/2.
  2. arcsin(−1) − arccos(−√2/2) = −π/2 − 3π/4 = −5π/4.
  3. arcsin(−1/2) − arctg √3 = −π/6 − π/3 = −π/2.
  4. arcsin 1 + arctg √3 = π/2 + π/3 = 5π/6.