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[" 21."(sin(-660^(@))^(8)tan(1050^(@))sec(-420^(@)))/(cos(225^(@))cosec(315^(@))cos(510^(@)))=],[[" 1) "(sqrt(3))/(4)," 2) "(sqrt(3))/(2)," 3) "(2)/(sqrt(3))," 4) "(4)/(sqrt(3))]]

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( sin (-660^(@)) tan (1050^(@)) sec (-420^(@)))/(cos(225^(@)) "cosec"(315^(@)) cos (510^(@)))=

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Prove that sin(-420^(@))(cos390^(@))+cos(-660^(@))(sin330^(@))=-1

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