सिद्ध करो कि : ` tan 10^(@) tan 15^(@) tan 75^@ tan80^(@)=1 `

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

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

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

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

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

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

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

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

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

tan 75 ^(@) - tan 30^(@)- tan 75^(@) tan 30^(@) =1.