[cot5^(@)-tan5^(@)-2tan10^(@)-4tan20^(@)...

[cot5^(@)-tan5^(@)-2tan10^(@)-4tan20^(@)-8cot40^(@)" is equal to "],[[" (a) "0," (b) "8tan40^(@)],[" (c) "8tan80^(@)," (d) none of these "]]

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