If you'll excuse me, Master Robin. The solution is X squared plus 2XY plus Y squared.
10 seconds sound clip from Batman (1966) - The Joker Goes to School (S1E15) TV Series.
You can hear this line at 00:18:28 in the Blu-ray version of the movie.
Quote context
[...]
- Look, you boobs. Look and laugh.
- X plus Y times X plus Y... Holy alphabet, what is it?
- If you'll excuse me, Master Robin. The solution is X squared plus 2XY plus Y squared.
- What'd you find out, Batman?
- Nothing. Holy vacuum, not a single clue?
- We don't need clues, Robin. We know our man is The Joker. What we need is evidence.
[...]