" 7."tan10^(@)tan15^(@)tan75^(@)tan80^(@)=?

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

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

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

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

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

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

Prove that: tan10^(@) tan20^(@)tan70^(@)tan80^(@)=1