80 Test file number 150

  80.1 Problem number 48
  80.2 Problem number 49
  80.3 Problem number 50
  80.4 Problem number 55
  80.5 Problem number 56
  80.6 Problem number 57
  80.7 Problem number 63
  80.8 Problem number 64
  80.9 Problem number 65
  80.10 Problem number 99
  80.11 Problem number 130

Test folder name:

test_cases/5_Inverse_trig_functions/5.3_Inverse_tangent/150_5.3.4_u-a+b_arctan-c_x-^p