Use truth tables to establish which of the equivalences are valid:Use truth tables to establish which of the equivalences are valid:

$P^{{?}^{?}}(PvvQ)-=P$

$(P^{{?}^{?}}R)Q-=(PR)vv(QR)$

$(PQ{)}^{{?}^{?}}(PR)-=(P^{{?}^{?}}Q)vv(-P^{{?}^{?}}R)$