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[" (a) "0],[" What is the value of "sin420^(@),cos390^(@)+cos(-],[300^(@))*sin(-330^(@))?],[[" (b) "0," (b) "1," (c) "2012" ( "1" ) "],[" (a) "," (d) "-1]]

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sin 420^(@) * cos 390^(@)- cos(-330^(@))* sin(-300^(@))=

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