Multiple choice general knowledge math & puzzles

what is the value of sec 90?;

  1. 0

  2. 1

  3. Not defined

  4. -1
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C Correct answer
Explanation

sec(90°) is not defined because sec θ = 1/cos θ, and cos(90°) = 0. Division by zero is undefined in mathematics. As the angle approaches 90°, sec(θ) approaches infinity, but at exactly 90°, it is undefined. This is a fundamental trigonometric concept.

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