[cos20^(@)+cos100^(@)+cos140^(n)=],[[" 1...

[cos20^(@)+cos100^(@)+cos140^(n)=],[[" 1) "0," 2) "1," 3) "2," 4) "3]]

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

cos 20^(@) + cos 100^(@) + cos 140^(@) =

cos 20^(@) + cos 100^(@) + cos 140^(@) = 0

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

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

Prove that: cos20^(@)+cos100^(@)+cos140^(@)=-0

cos20^@cos40^@cos80^@=

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

Prove that cos20^(@) cos40^(@) cos80^(@) = 1/8

cos^(3) 20^(@) + cos^(3) 100^(@) + cos^(3) 140^(@) =

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