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`

सिद्ध करें कि cos^(2)10^(@)+cos^(2)20^(@)+cos^(2)30^(@)+cos^(2)40^(...
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cos ^ (2) 10 ^ (@) + cos ^ (2) 50 ^ (@) + cos ^ (2) 70 ^ (@) =
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Express the rational number S=cos^(2)(10^(@))+cos^(2)(20^(@))+cos^(2)(...
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The value of cos^(2)10^(@)-cos10^(@) cos 50^(@) + cos^(2) 50^(@) is
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cos^(2) 20^(@) + cos ^(2) 70^(@) + sin 48^(@) sec 42^(@) + cos 40^(@)...
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सिद्ध करें कि cos^(2)10^(@)+cos^(2)20^(@)+cos^(2)30^(@)+cos^(2)40^(...
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If A= cos^(2) 10^(@) + cos^(2) 50^(@) + cos^(2) 70^(@) , B= sin^4"" (...
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Prove that cos^(2)40^(@)cos^(2)80^(@)+cos^(2)80^(@)cos^(2)20^(@)+cos^(...
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cos^2 20^@ + cos^2 70^@ का मान है:
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