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[" (1) "tan48^(@)tan23^(@)tan42^(@)tan67...

[" (1) "tan48^(@)tan23^(@)tan42^(@)tan67^(@)=1],[cos38^(@)cos52^(@)-sin38^(@)sin52^(@)=0]

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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:(i) tan48^@tan23^@tan42^@tan67^@=1

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

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

Show that : (i) tan\ 48^@ tan 23^@\ tan 42^@tan 67^@=1 (ii) cos 38^@\ cos 52^@ - sin 38^@ sin 52^@=0

Show that : tan48^@tan23^@tan42^@tan67^@=1 .