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cos120^(@)cos240^(@)-sin120^(@)sin240^(@...

cos120^(@)cos240^(@)-sin120^(@)sin240^(@)=1

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sin120^(@)cos150^(@)-cos240^(@)sin330^(@)=

sin120^(@)cos150^(@)-cos240^(@)sin330^(@)

cos510^(@)cos330^(@)+sin390^(@)cos120^(@)

Prove that, cos510^(@)cos330^(@)+sin390^(@)cos120^(@)=-1 .

cos120^(@)=cos(90^(@)+30^(@)) =-sin30^(@)=-(1)/(2)

sin150^(@).cos120^(@)+cos330^(@)*sin660^(@)=-1

Find the value of sin330^(@)cos120^(@)+cos210^(@)sin300^(@)

sin 120^(@) cos 150^(@)- cos 240^(@) sin 330^(@) =

sin 120^(@) cos 150^(@)- cos 240^(@) sin 330^(@) =

The value of sin600^(@)cos330^(@)+cos120^(@)sin150^(@) is