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[(cos^(4)A-sin^(4)A)" is equal to "],[["...

[(cos^(4)A-sin^(4)A)" is equal to "],[[" (a) "1-2cos^(2)A," (b) "2sin^(2)A-1],[" (c) "sin^(2)A-cos^(2)A," (d) "2cos^(2)A-1]]

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