`tan 20^0 tan 30^0 tan 40^0 tan 80^0=1`

Prove that : tan 20^0 tan 40^0 tan 60^0 tan 80^0 =3

Prove that: t a n 20^0tan40^0tan60^0tan80^0=3

Prove that tan20^0tan40^0tan60^0tan80^0 =3

tan10^(@) tan 20^(@) tan 30^(@) tan 40^(@) tan 50^(@) tan 60^(@) tan 70^(@) tan 80^(@)=

Prove that tan 20^@tan 40^@ tan 60^@ tan 80^@ = 3

Prove that tan20^@tan30^@tan40^@tan80^@=1

Prove the following : tan 20^@ tan 40^@ tan 80^@= tan 60^@ .

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

Without using trigonometric tables, evaluate each of the following: (-tanthetacot(90^0-theta)+secthetacos e c(90^0-theta)+sin^2 35^0+sin^2 55^0)/(tan10^0tan20^0tan30^0tan70^0tan80^0)

Without using trigonometric tables, evaluate each of the following: (-tanthetacot(90^0-theta)+secthetacos e c(90^0-theta)+sin^2 35^0+sin^2 55^0)/(tan10^0tan20^0tan30^0tan70^0tan80^0)