91 Test file number 176

  91.1 Problem number 8
  91.2 Problem number 23
  91.3 Problem number 46

Test folder name:

test_cases/6_Hyperbolic_functions/6.4_Hyperbolic_cotangent/176_6.4.7-d_hyper-^m-a+b-c_coth-^n-^p