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[" 3."tan20^(@)+tan40^(@)+sqrt(3)tan20^(...

[" 3."tan20^(@)+tan40^(@)+sqrt(3)tan20^(@)tan40^(@)" is equal to "],[[" (a) "(sqrt(3))/(4)," (b) "(sqrt(3))/(2)," (c) "sqrt(3)," (d) "1]]

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tan20^(@)-tan80^(@)+sqrt(3)tan20^(@)tan80^(@)=

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