12 Test file number 150

  12.1 Problem number 141
  12.2 Problem number 142
  12.3 Problem number 143
  12.4 Problem number 144
  12.5 Problem number 145
  12.6 Problem number 146
  12.7 Problem number 147
  12.8 Problem number 1228

Test folder name:

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