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[tan48^(@)tan23^(@)tan42^(@)tan67^(@)=1]...

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

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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

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

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

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

The value of cos38^(@)cos52^(@)-sin38^(@)sin52^(@) is :

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

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

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