Question
A ↔ ~ ~ A

Answer

Truth table:
Column $\rightarrow$ 1 2 3 4
Row $\downarrow$ A ~ A ~ ~ A A$\leftrightarrow$ ~ ~ A
1 T F T T
2 F T F T
  1(~) 2(~) 1, 3 ($\leftrightarrow$)
Explanation: A↔ ~ ~ A Column no. 1 is the first column, while the remaining three are secondary columns. Column no. 4 presents the whole complex joint statement. Column no. 4 The following facts become clear:
(1) According to the first row, if A is true, then A↔ ~ ~ A is the whole statement is true.
(2) According to the second row, if A is untrue, then A↔ ~ ~ A is the whole statement is true.

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