A function f(t) is an even function if for all values of

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A function f(t) is an even function if for all values of (t)—
(T is the time-period of the function)

1. f(t) = f(– t)
2. f(t) = – f(– t)
3. f(t) = f t + T
  2
4. f(t) = – f t + T
  2

Correct Option: A

For a function f(t) to be even the required condition is
f(t) = f(– t)