साबित करें कि tan 20^(@) tan 40^(@) tan ...

साबित करें कि `tan 20^(@) tan 40^(@) tan 60^(@) tan 80^(@) = 3`
[ Hint `:` ` sin 20^(@) sin 40^(@)sin60^(@) sin80^(@) ` और `cos 20^(@) cos 40^(@) cos 60^(@) cos 80^(@) ` का मान निकालें और भाग दें ।

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sin20^(@)sin40^(@)sin60^(@)sin80^(@)

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

Find sin20^(@)sin40^(@)sin60^(@)sin80^(@) .

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

cos20^(@)cos40^(@)cos60^(@)cos80^(@)=

cos20^(@).cos40^(@).cos60^(@).cos80^(@) is :

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

cos20^(@).cos40^(@).cos60^(@).cos80^(@)=1/16