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[" 13.The value of the expression "sqrt(...

[" 13.The value of the expression "sqrt(3)cosec20^(@)-sec20^(@)" is "],[" equal to "],[[" (a) "2],[" (b) "2sin20^(@)/sin40^(@)],[" (c) "4],[" (d) "4sin20^(@)/sin40^(@)]]

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sqrt(3)cos sec20^(0)-sec20^(@)

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