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tan 9^(@) - tan 27^(@) - tan 63^(@) + ...

` tan 9^(@) - tan 27^(@) - tan 63^(@) + tan 81^(@)` का मान क्या है ?

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Prove that tan 9^(@) - tan 27^(@) -tan 63^(@) + tan 81^(@) =4

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Value of tan9^@ - tan27^@ - tan63^@ + tan81^@ is ?