Truth-tables

Draw truth-tables for the formulae below (you may omit any verbal explanation):

1. $\neg$($\neg$P $\wedge$ $\neg$Q)
2. ((P $\rightarrow$ Q) $\vee$ $\neg$Q)
3. (P $\leftrightarrow$ ((Q $\leftrightarrow$ Q) $\leftrightarrow$ P))