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सिद्ध कीजिए कि - sin660^(@)cos330^(@)+...

सिद्ध कीजिए कि -
`sin660^(@)cos330^(@)+sin150^(@)cos120^(@)=-1`.

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

cos 510^@cos330^@+sin 390^@cos120^@ =

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

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

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

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

Prove that: cos510^(0)cos330^(@)+s in390^(@)cos120^(@)=-1

Prove that cos510^@cos330^@+sin390^@cos120^@=-1

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

Show that cos510^@cos330^@-sin390^@cos120^@=-1/2