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Let f : R →R and g : R →R be continuous functions, then the value of not stretchy integral subscript negative pi divided by 2 end subscript superscript pi text /2 end text end superscript blank (f(x) + f(-x)) (g(x) – g(-x)) dx, is equal to

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  1. – 1    
  2. 0    
  3. 1    
  4. None of these    

    Answer:The correct answer is: 0

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