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cos e c(360^0)/7+cos e c(540^0)/7= (a) c...

`cos e c(360^0)/7+cos e c(540^0)/7=` (a) cosec(180^0)/7` ,(b) `cosec(90^0)/7` `, (c) sec(180^0)/7` , (d) `sec(90^0)/7`

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