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General
Easy

Question

If square root of 2 cos space A equals cos space B plus cos cubed space B text  and  end text square root of 2 sin text end text A equals sin space B minus sin cubed space B then sin (A-B) =

  1. plus-or-minus 1
  2. plus-or-minus 1 half
  3. plus-or-minus 1 third
  4. plus-or-minus 1 fourth

The correct answer is: plus-or-minus 1 third

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