sin780^(@)sin480^(@)+cos240^(@)cos300^(@)=(1)/(2)

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

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

Prove that: s in780^(@)s in480^(@)+cos120^(@)s in150^(@)=(1)/(2)

Prove that sin750^(@)cos480^(@)+cos120^(@)cos60^(@)=(-1)/2

Prove that sin 780^(@) sin 480^(@)+cos240^(@). Cos300^(@) = 1/2

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

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

Show that sin 750 ^(@) cos 480^(@) + cos 120 ^(@) cos 60 ^(@)=-1/2

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