10.cos20^(@)+cos100^(@)+cos140^(@)=0...

10.cos20^(@)+cos100^(@)+cos140^(@)=0

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

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

Find the value of cos20^(@)+cos100^(@)+cos140^(@):

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

Prove that: cos20^(0)cos100^(@)+cos100^(@)cos140^(@)-cos140^(@)-cos140^(@)cos200^(@)=

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

cos 20^(@) + cos 100^(@) + cos 140^(@)= A) cos 130^(@) B) cos 45 ^(@) C)0D)none of these

Prove that, cos20^(@)+cos60^(@)+cos100^(@)+cos140^(@)=(1)/(2)

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