20 Test file number 74

  20.1 Problem number 468
  20.2 Problem number 469
  20.3 Problem number 470
  20.4 Problem number 471

Test folder name:

test_cases/4_Trig_functions/4.1_Sine/74_4.1.2.2-g_cos-^p-a+b_sin-^m-c+d_sin-^n