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Sticky Note
sec0 = _____?
  1. -1
  2. 0
  3. 1
  4. None of these
Explanation

The secant of an angle θ is defined as 1/cos(θ).

For θ = 0, cos(0) = 1.

sec(0) = 1/cos(0) = 1/1 = 1.

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