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cos^(3)10^(@)+cos^(3)110^(@)+cos^(3)130^...

cos^(3)10^(@)+cos^(3)110^(@)+cos^(3)130^(@)=

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cos^(3)110^(@)+cos^(3)10^(@)+cos^(3)130^(@)=

cos ^(3) 110 ^(@) + cos ^(3) 10^(@) + cos ^(3) 130^(@)=

cos ^(3) 110 ^(@) + cos ^(3) 10^(@) + cos ^(3) 130^(@)=

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

8 cos^(3) 10^(@) -6 cos 10^(@) =

i) Prove that: cos^(3)2A+3cos2A = 4(cos^(6)A-sin^(6)A) ii) Prove that: 4(cos^(3)10^(@) + sin^(3)20^(@)) = 3(cos10^(@)+sin20^(@))

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

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

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