सिद्ध कीजिए कि- sin^(2)""(pi)/(18)+sin^(...

सिद्ध कीजिए कि- `sin^(2)""(pi)/(18)+sin^(2)""(pi)/(9)+sin^(2)""(7pi)/(18)+sin^(2)""(4pi)/(9)=2`

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सिद्ध कीजिए कि- sin^(2)""(pi)/(18)+sin^(2)""(pi)/(9)+sin^(2)""(7pi)/(1...
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