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    Maths-
    General
    Easy

    Question

    cos space left parenthesis x minus y right parenthesis plus cos space left parenthesis y minus z right parenthesis plus cos space left parenthesis z minus x right parenthesis equals negative 3 over 2 not stretchy rightwards double arrow sum left parenthesis cos space x right parenthesis equals

    1. 0
    2. 1
    3. 2
    4. 3

    The correct answer is: 0

      x minus y equals y minus z equals z minus x equals 120 to the power of ring operator
      y equals x minus 120 to the power of ring operator comma z equals x plus 120 to the power of ring operator
      therefore sum c o s space x equals c o s space x plus c o s space left parenthesis x minus 120 to the power of ring operator right parenthesis plus c o s space left parenthesis x plus 120 to the power of ring operator right parenthesis equals 0

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