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सिद्ध कीजिए कि cos 80^(@)+cos 40^(@)=c...

सिद्ध कीजिए कि
`cos 80^(@)+cos 40^(@)=cos 20^(@)`

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cos 20^(@) cos 40^(@) cos 80^(@)=

cos 40^(@) + cos 80^(@) + cos 160^(@) =

cos20 ^ (@) cos40 ^ (@) cos80 ^ (@) =

Prove that cos80^(@)+cos40^(@)-cos20^(@)=0 .

cos20^(@)cos40^(@)cos60^(@)cos80^(@)=

cos80 ^ (0) + cos40 ^ (@) - cos20 ^ (@) = 0

(2cos40^(@)-cos20^(@))/(sin20^(@))

(2cos40^(@)-cos20^(@))/(sin20^(@))

Prove that: cos80^(@)+cos40^(@)-cos20^(@)=0

Prove that, cos80^(@)+cos40^(@)-cos20^(@)=0