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78.quad cos10^(@)+cos110^(@)+cos130^(@)=...

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

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

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

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 .

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

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

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