What is the root over 1 tan^2 c joke?

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The expression “square root of (1 plus tan squared of C)” is mathematically equivalent to “sec of C”. This is due to the trigonometric identity that “1 plus tan squared of C” equals “sec squared of C”. When you take the square root of both sides of this identity, “square root of (1 plus tan squared of C)” is equal to “sec of C”.

However, when spoken aloud, “sec of C” can sound like “sexy,” leading to a playful and unexpected connection between a dry mathematical concept and a casual, light-hearted term.