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[" 7.If "sin(alpha+beta)=1,sin(alpha-bet...

[" 7.If "sin(alpha+beta)=1,sin(alpha-beta)=1/2" then "tan(alpha+2 beta)tan(2 alpha+beta)=],[[" 1) "1," 2) "-1," 3) "0," 4) None "]]

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