`tan2 0^0tan4 0^0tan6 0^0tan8 0^0`

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

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

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

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

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

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

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

Evaluate: (secthetacos e c(90^0-theta)-tanthetacot(90^0-theta)+sin^2 55^0+sin^2 35^0)/(tan10^0tan20^0tan60^0tan70^0tan80^0)

Evaluate : (2sin68^0)/(cos22^0)-(2cot15^0)/(5tan75^0)-(3tan45^0tan20^0tan40^0tan50^0tan70^0)/5

If tan20^0+tan40^0+tan80^0-tan60^0 = lambdasin40^0 , find lambda.