`tan10^(@)" "tan15^(@)" "tan75^(@)" "tan80^(@) `का मान है?

tan15^(@) + tan 75^(@)=

tan 20^(@) tan 40^(@) tan 60^(@) tan 80^@=

tan 20^(@) tan 40^(@) tan 80^(@) = tan 60^(@)

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

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

(tan80^(@)-tan10^(@))/(tan70^(@))

(tan80^(@)-tan10^(@))/(tan70^(@))

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

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