Which calculator manufacturer had to recall over 1 million units in 2011 due to a critical calculation error that affected trigonometric functions?

In the world of mathematics education products, not every innovation succeeds. This trivia question explores a famous product recall that affected mathematics students and educators across the United States in the early 2010s. The incident raised important questions about quality control in educational technology and had significant financial implications for the company involved.

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Texas Instruments
Casio
HP
Sharp