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[" The aldie of "sin^(2)5^(@)+sin^(2)(b)...

[" The aldie of "sin^(2)5^(@)+sin^(2)(b)8],[[" (a) "7," (c) "1],[" Jf "A+B+C=pi," then secA "(cos B cos C-sin B sin C)" is equal to "],[" (b) "-1]]

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