[cos^(2)17^(@)+cos'5^(@)sin65^(@)],[sin25^(@)cos65^(@)+cos25^(@)Justify" your choice."],[" che correct option.Justify "]

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sin25^(@)cos65^(@)+cos25^(@)sin65^(@)

cos20^(@)cos40^(@)-sin5^(@)sin25^(@)=

2sin65^@cos25^@=

(sin 65^(@) + sin 25^(@))/( cos 65^(@) + cos 25^(@))=

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

sin65^(@)+cos65^(@)=sqrt(2)cos20^(@)

sin 85^(@)-sin 35^(@) - cos 65^@