1. chart method, you list the truth values of all expressions, which is troublesome but intuitive.

2. Identity method

(p∧？ q)∨(？ p∧q)

=[(p∧？ q)∨？ p]∧[(p∧？ Q)∞q]- distribution law

=[(p∨？ p)∧(？ q∨？ p)]∧[(p∨q)∧(？ Q∨q)]-distribution law

=[T∧(？ q∨？ P)]∧[(p∨q)∧T]-Negative Law

=(? q∨？ P)∧(p∨q)-identity law

=(p∞q)∧(？ q∨？ P)-commutative law

=(p∞q)∧？ (p∧q)-De Morgan's Law