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Show that : tan 48 ^@ tan 23^@ ...

Show that :
` tan 48 ^@ tan 23^@ tan 42^@ tan 67 ^@ = 1 `

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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^(@) tan 23^(@) tan 42^(@) tan 67^(@) =1 .

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

Show that : tan 48^(@) tan 16^(@) tan 42^(@) tan 74^(@) = 1 .

tan 6 ^(@) tan 42 ^(@) tan 66 ^(@) tan 78^(@) =1

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

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

Show that tan 48^(@) tan 16^(@) tan 42^(@) tan 74^(@) =1

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))