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Sticky Note
Which of the following is an even function? sinx, tanx, cosx, None of these
  1. sinx
  2. tanx
  3. cosx
  4. None of these
Explanation
An even function satisfies the rule f(-x) = f(x).
cos(-x) = cos(x), so cos x is an even function.

Last verified on 03-07-2026

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