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If fraction numerator cos space x over denominator a end fraction equals fraction numerator cos begin display style space end style left parenthesis x plus theta right parenthesis over denominator b end fraction equals fraction numerator cos begin display style space end style left parenthesis x plus 2 theta right parenthesis over denominator c end fraction equals fraction numerator cos begin display style space end style left parenthesis x plus 3 theta right parenthesis over denominator d end fraction then fraction numerator a plus c over denominator b plus d end fraction is equal to

  1. a/d
  2. c/d
  3. b/c
  4. d/a

The correct answer is: b/c

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