| Answer | Crossword Clue |
|---|---|
| PSANDQS | Manners expressed in letters |
| identity | The equality of two expressions for all values of the quantities expressed by letters, or an equation expressing this, e.g., (x + 1)2 = x2 + 2x + 1 |
| identities | The equality of two expressions for all values of the quantities expressed by letters, or an equation expressing this, e.g., (x + 1)2 = x2 + 2x + 1 |
