18 Test file number 118

  18.1 Problem number 236
  18.2 Problem number 253
  18.3 Problem number 256
  18.4 Problem number 260
  18.5 Problem number 263
  18.6 Problem number 264
  18.7 Problem number 416
  18.8 Problem number 428
  18.9 Problem number 431
  18.10 Problem number 434
  18.11 Problem number 435
  18.12 Problem number 438

Test folder name:

test_cases/4_Trig_functions/4.5_Secant/118_4.5.1.2-d_sec-^n-a+b_sec-^m