यदि tan theta + tan (60^(@) + theta ) +...

यदि ` tan theta + tan (60^(@) + theta ) + tan ( 120^(@)+ theta )=3`,
तो सिद्ध कीजिए कि - ` (3 tan theta - tan ^(3) theta )/( 1-3 tan^(2) theta )=1`

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