Question:medium

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

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For composite functions, always find the range from inside to outside step-by-step.
Updated On: Apr 23, 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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