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सिद्ध करें कि cos^(2)10^(@)+cos^(2)20...

सिद्ध करें कि
`cos^(2)10^(@)+cos^(2)20^(@)+cos^(2)30^(@)+cos^(2)40^(@)+cos^(2)50^(@)+cos^(2)60^(@)+cos^(2)70^(@)+cos^(2)80^(@)=4`

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