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unit circle

   Also found in: Wikipedia 0.02 sec.
unit circle [′yü·nət ′sər·kəl]
(mathematics)
The locus of points in the plane which are precisely one unit from the origin.


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Super-sizing the protractor also enables two-figure readings for sine and cosine ratios and space to add other information such as unit circle coordinates thus making the protractor more effective as a learning aid.
Typical constraints imposed on ARIMA models are that, when B is regarded as a complex variable, the polynomial in B representing the generalized autoregressive operator has zeros on or outside the unit circle ([absolute value of B]=1), whereas the polynomials representing the ordinary autoregressive operator and the moving average operator have zeros outside the unit circle.
 
 
 
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