Question:medium

The range of \(f(x) = \sec\left(\frac{\pi}{4}\cos^2 x\right)\), \(-\infty<x<\infty\) is

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\(\sec\theta \ge 1\) for \(\theta \in [0, \pi/2)\).
Updated On: Apr 7, 2026
  • \([1, \sqrt{2}]\)
  • \([1, \infty)\)
  • \([-\sqrt{2}, -1] \cup [1, \sqrt{2}]\)
  • \((-\infty, 1] \cup [1, \infty)\)
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The Correct Option is A

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