A set of four equivalent orbitals can be obtained which are linear combinations of the valence-shell ( core orbitals are almost never involved in bonding ) s and p wave functions which are the four sp3 hybrids .
To achieve this equivalence , the angular distributions of the orbitals change via a linear combination of the valence-shell ( Core orbitals are almost never involved in bonding ) s and p wave functions to form four sp3 hybrids .