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सिद्ध कीजिए कि - sin780^(@)sin120^(@)+c...

सिद्ध कीजिए कि -
`sin780^(@)sin120^(@)+cos120^(@)sin390^(@)=(1)/(2)`.

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Explore conceptually related problems

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

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

Prove that: sin780^(@)s in120^(@)+cos240^(@)sin390^(@)=(1)/(2)

Prove that sin780^(@)*sin480^(@)+cos120^(@)*sin150^(@)=(1)/(2)

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

sin30^(@)+sin60^(@)+sin90^(@)+sin120^(@)

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

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

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

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