66 Test file number 105

  66.1 Problem number 50
  66.2 Problem number 57
  66.3 Problem number 58
  66.4 Problem number 64
  66.5 Problem number 65

Test folder name:

test_cases/4_Trig_functions/4.3_Tangent/105_4.3.4.2-a+b_tan-^m-c+d_tan-^n-A+B_tan+C_tan^2-