Satu per x kuadrat tambah empat x tambah tiga Ditambah Satu per x tambah tiga

1/(x^2+ 4x + 3)+1/(x+3) =
1/(x+1)(x+3) + 1/(x+3) = (1+x+1)/(x+1)(x+3) =
(x+2)/ (x+1)(x+3)