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" ove that : "sin150^(@)cos120^(@)+cos33...

" ove that : "sin150^(@)cos120^(@)+cos330^(@)sin660^(@)+1=0

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

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

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

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

Prove that: sin 150^@ cos 120^@+ cos 330^@ sin 660^@= - 1 .

Prove that: sin420^(@)cos390^(@)+cos(-300^(@))sin(-330^(@))=1

Prove that: sin(-420^(@))cos390^(@)+cos(-660^(@))sin330^(@)=1

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

sin 420^(@) * cos 390^(@)- cos(-330^(@))* sin(-300^(@))=

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