Propositional logic/Tautology/Associativity law/Truth tables/Exercise

Prove, with the help of truth tables, that the following statements are tautologies.

1. ${}{\left(\alpha \wedge \beta \right)}\wedge \gamma \longleftrightarrow \alpha \wedge {\left(\beta \wedge \gamma \right)}$.
2. ${}{\left(\alpha \vee \beta \right)}\vee \gamma \longleftrightarrow \alpha \vee {\left(\beta \vee \gamma \right)}$.

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