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cos130^(@)+cos110^(@)+cos10^(@)=0...

`cos130^(@)+cos110^(@)+cos10^(@)=0`

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What is the value of cos10^(@)+cos110^(@)+cos130^(@) ?

cos 10^(@) cos 30^(@) cos 50^(@) cos 70^(@) =

cos170^(@)cos150^(@)cos130^(@)cos110^(@)=

cos 10^(@) cos 30^(@) cos 50^(@) cos 70^(@) =(3)/(16)

Prove that cos 10^(@) + cos 110^(@) + cos 130^(@) = 0

Show that cos 10^(@) + cos 110^(@) + cos 130^(@) = 0

Prove the following Identities cos 10^(@) + cos 110^(@) + cos 130^(@) = 0

Prove that : cos 10^(@) + cos 110^(@) + cos 130^(@) = 0 .

The value of cos^(2)10^(@)-cos10^(@) cos 50^(@) + cos^(2) 50^(@) is