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[" If "x=cos10^(@)cos20^(@)cos40^(@)," t...

[" If "x=cos10^(@)cos20^(@)cos40^(@)," then the value "],[[" (a) "(1)/(4)tan10^(@)," (b) "(1)/(8)cot10^(@)],[" (c) "(1)/(8)cosec10^(@)," (d) "(1)/(8)sec10^(@)]]

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