23 Test file number 40

  23.1 Problem number 259
  23.2 Problem number 266
  23.3 Problem number 273

Test folder name:

test_cases/1_Algebraic_functions/1.2_Trinomial_products/1.2.2_Quartic/40_1.2.2.3-d+e_x^2-^m-a+b_x^2+c_x^4-^p