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[" 1) cos "12],[" 2.Show that: "],[" (1)...

[" 1) cos "12],[" 2.Show that: "],[" (1) "tan48^(@)" tan "23^(@)" tan "42^(@)tan67^(@)=1],[" (i) "cos38^(@)cos52^(@)-sin38^(@)sin52^(@)=0]

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Show that : cos38^(@)cos52^(@)-sin38^(@)sin52^(@)=0

Show that tan48^(@) tan 23^(@) tan 42^(@) tan 67^(@) =1 .

Show that tan48^(@) tan 23^(@) tan 42^(@) tan 67^(@) =1 .

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

show that tan48^(@).tan23^(@)*tan42^(@)*tan67^(@)=1

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

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

Show that tan48^(@)tan16^(@)tan42^(@)tan74^(@)=1