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

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

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

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

Evaluate : tan7^(@)tan23^(@)tan60^(@)tan67^(@)tan83^(@)+(cot54^(@))/(tan36^(@))+sin20^(@)sec70^(@)-2

Evaluate : tan7^(@)tan23^(@)tan60^(@)tan67^(@)tan83^(@)+(cot54^(@))/(tan36^(@))+sin20^(@)sec70^(@)-2

Prove that tan12^(@)tan24^(@)tan48^(@)tan84^(@)=1

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

Without using trigonometric tables, prove that : (i) tan 48^@tan 23^@tan 42^@tan 67^@ =1 (ii) tan 7^@tan 23^@ tan 60^@ 67^@tan 83^@=sqrt(3) (iii) cot 12^@cot 38^@cot 52^@cot 60^@cot 78^@=(1)/(sqrt(3))