" (1) "tan10^(@)tan15^(@)tan75^(@)tan80^(@)

The value of tan10^(@)tan15^(@)tan75^(@)tan80^(@) is

Show that: tan 10^(@)tan 15^(@) tan 75^(@)tan 80^(@)=1

Choose the correct answer in each of the following questions: tan 10^(@) tan15^(@)tan75^(@)tan80^(@)=?

tan20^(@)tan40^(@)tan60^(@)tan80^(@)

tan20^(@)tan40^(@)tan80^(@)

Show that : (i) tan 10^(@) tan 15^(@) tan 75^(@) tan 80^(@) = 1 (ii) sin 42^(@) sec 48^(@) + cos 42^(@) "cosec 48"^(@) = 2

tan20^(@)tan40^(@)tan60^(@)tan80^(@)=?

tan20^(@)tan30^(@)tan40^(@)tan80^(@)=1

tan10^@tan15^@tan75^@tan80^@ is

The value of tan 10^(@)* tan20^(@)*tan45^(@)*tan70^(@)*tan80^(@) =_________