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[" (a) "2BD^(2)],[" The value of "tan48^...

[" (a) "2BD^(2)],[" The value of "tan48^(@)*tan23^(@)*tan42^(@)*tan67^(@)is:],[[" (a) "1," cen tran "A=1" ,then "2sin A*cos]]

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Shown that : tan48^(@)tan23^(@)tan42^(@)tan67^(@)=1

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