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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^(@)sin6...

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

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