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His deadline was midnight. It was 11:47 PM.

x = -2, 2 .

For three hours, he had searched. The square root symbol—that elegant radical, that roof over numbers—was missing. He knew the command for π. He knew the one for ±. But √? It was a ghost.

“It’s just a key,” he whispered, stabbing the backslash, the forward slash, the little squiggly line under the escape button. Nothing. He opened the Character Viewer: Option-V . His fingers trembled over the keyboard. He pressed Option, then V.