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

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

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

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

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

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

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

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

Prove that: sin600^(@)cos390^(@)+cos480^(@)s in150^(@)=-1

Prove that: sin 780^0sin 480^0+cos 120^0sin 150^0=1/2

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