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Question

Which of the following has period 2straight pi

  1. f left parenthesis x right parenthesis equals s i n invisible function application open parentheses 2 pi x plus fraction numerator pi over denominator 3 end fraction close parentheses plus 2 s i n invisible function application open parentheses 3 pi x plus fraction numerator pi over denominator 4 end fraction close parentheses plus 3 s i n invisible function application 5 pi x    
  2. f open parentheses x close parentheses equals sin invisible function application fraction numerator pi x over denominator 3 end fraction plus sin invisible function application fraction numerator pi x over denominator 4 end fraction    
  3. f left parenthesis x right parenthesis equals s i n invisible function application x plus c o s invisible function application 2 x    
  4. None of these    

The correct answer is: f left parenthesis x right parenthesis equals s i n invisible function application x plus c o s invisible function application 2 x

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