84 Test file number 156

  84.1 Problem number 69
  84.2 Problem number 76
  84.3 Problem number 81
  84.4 Problem number 82
  84.5 Problem number 87

Test folder name:

test_cases/5_Inverse_trig_functions/5.5_Inverse_secant/156_5.5.1_u-a+b_arcsec-c_x-^n