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Prove that sqrt(3)"cosec"20^(@)-"sec"20^...

Prove that `sqrt(3)"cosec"20^(@)-"sec"20^(@) =4`.

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sqrt3"cosec"20^(@) - sec20^@ =

Prove that sqrt3 csc 20 ^(@)- sec 20^(@)=4

sqrt(2)* " cosec " 20^(@) sec 20^(@)=

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"cosec" 15^(@) + sec 15^(@) =