[" (vi) "sin85^(@)-cos65^(@)=cos55^(@)],...

[" (vi) "sin85^(@)-cos65^(@)=cos55^(@)],[" (vii) "sin18^(@)+cos18^(@)=sqrt(2)cos27^(@)]

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

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

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