15 Test file number 92

  15.1 Problem number 89
  15.2 Problem number 90
  15.3 Problem number 96
  15.4 Problem number 100
  15.5 Problem number 101
  15.6 Problem number 102
  15.7 Problem number 103
  15.8 Problem number 105
  15.9 Problem number 106
  15.10 Problem number 111
  15.11 Problem number 112
  15.12 Problem number 113
  15.13 Problem number 120
  15.14 Problem number 182
  15.15 Problem number 519

Test folder name:

test_cases/4_Trig_functions/4.2_Cosine/92_4.2.3.1-a+b_cos-^m-c+d_cos-^n-A+B_cos-