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" (iv) "sin150^(@)cos120^(@)+cos330^(@)s...

" (iv) "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^(@) =

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

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

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

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

The value of sin 600^(@) cos 330^(@)+ cos 120^(@) sin 150^(@) is