[" प 14.सिद्ध कीजिए कि- "],[qquad sin(pi...

[" प 14.सिद्ध कीजिए कि- "],[qquad sin(pi)/(7)+sin(2 pi)/(7)+sin(8 pi)/(7)+sin(9 pi)/(7)=0]

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[" प 14.सिद्ध कीजिए कि- "],[qquad sin(pi)/(7)+sin(2 pi)/(7)+sin(8 pi)/...
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show that sin (2 (pi) / (7)) + sin (4 (pi) / (7)) + sin (8 (pi) / (7))...
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