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a squared plus b squared plus 2 a b cos space theta equals 1 comma c squared plus d squared plus 2 c d cos space theta equals 1 and a c plus b d plus left parenthesis a d plus b c right parenthesis cos space theta equals 0 then a squared plus c squared =

  1. sec squared space theta
  2. c o sec squared space theta
  3. cot squared space theta
  4. tan squared space theta

The correct answer is: c o sec squared space theta

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