[[" 7.किय डिरो: "]],[" (i) "tan20^(@)tan...

[[" 7.किय डिरो: "]],[" (i) "tan20^(@)tan35^(@)tan45^(@)tan55^(@)tan70^(@)=1],[[" (ii) "sin48^(@)sec42^(@)+cos48^(@)cosec42^(@)=2]]

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sin48^(@)sec42^(@)+cos48^(@)csc42^(@)=

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