The Recording Artists' Coalition (RAC) is an American music industry organization that represents recording artists[?], and attempts to defend their rights and interests. Compare and contrast with the RIAA, which represents the recording industry.
Their most vocal and energetic actions have been in support of repealing laws which tie artists to contracts with record labels for seven years.
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The symbol
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in the formula should be understood as "either of those element(s) of the field whose square equals b2 - ...