30 Test file number 47

  30.1 Problem number 50
  30.2 Problem number 61
  30.3 Problem number 62

Test folder name:

test_cases/1_Algebraic_functions/1.2_Trinomial_products/1.2.3_General/47_1.2.3.3-d+e_x^n-^q-a+b_x^n+c_x^-2_n-^p