60.cos20^(@)+cos100^(@)+cos140^(@)tan44^(@)tan^(2)pivec @?

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

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

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

The value of cos20^(@)cos100^(@)+cos100^(@)cos140^(@)-cos140^(@)cos200^(@) is equal to

(cos20^(@)-sin20^(@))/(cos20^(@)+sin20^(@))=tan25^(@)

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

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

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

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