Let f(x) be an even function then \(\rm \int_{-a}^{a}f(x)dx=?\)

  1. 0
  2. 1
  3. \(\int_{0}^{a}f(x)dx\)
  4. \(2\int_{0}^{a}f(x)dx\)

Answer (Detailed Solution Below)

Option 4 : \(2\int_{0}^{a}f(x)dx\)
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Detailed Solution

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Concept:

A function is said to even if  f(-x) = f(x)

A function is said to be odd if  f(-x) = -f(x)

 

Calculation:

For an even function

\(\rm \Rightarrow \int_{-a}^{a}f(x)dx=2\int_{0}^{a}f(x)dx\)

If function is odd then 

\(\rm \Rightarrow \int_{-a}^{a}f(x)dx=0\)

Hence , 4 is correct

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