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cos55^(@)+cos65^(@)+cos175^(@)=...

cos55^(@)+cos65^(@)+cos175^(@)=

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Prove that cos 55^(@)+cos65^(@)+cos175^(@)=0

Prove that: cos55^(@)+cos65^(0)+cos175^(0)=0

cos175^(@)+cos65^(@)+cos55^(@)=?

Prove that: cos175^(@)+cos65^(@)+cos55^(@)=0

find cos175^(@)+cos65^(@)+cos55^(@)

cos 55^(@) + cos 65^(@) + cos 175^(@)= A)0B)1C) sin 18^(@) D) cos 36 ^(@)

x=cos55^(@),y=cos65^(@),z=cos175^(@) then xy+yz+xz=

Prove that sin85^(@) - cos65^(@) +cos55^(@)=0

cos 25^(@) - cos65^(@) =