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[" 25.What is "cos20^(@)+cos100^(@)+cos140^(@)" equal to "],[[" (a) "2," (b) "1," (c) "1/2," (d) "0]]

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What is cos20^@ + cos 100^@ + cos 140^@ equal to?

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

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

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

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

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

What is cos80^@ + cos 40^@ - cos20^@ equal to ?

1 + cos 10^(@) + cos 20^(@) + cos30^(@) =

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

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