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Prove that :sin 420^@ cos390^@+cos(-300^...

Prove that :`sin 420^@ cos390^@+cos(-300^@)sin(-330^@)=1`

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Prove that: sin420^(@)cos390^(@)+cos(-300^(@))sin(-330^(@))=1

Prove that: cos420^@ sin390^@+ sin(-300^@)cos(-330^@)=1

Prove that: sin(-420^(@))cos390^(@)+cos(-660^(@))sin330^(@)=1

Prove that sin(-420^(@))(cos390^(@))+cos(-660^(@))(sin330^(@))=-1

What is the value of Sin420^@.cos390^@ + cos(-300^@). sin(-330^@ )?

Prove that: "sin"420^(@) cos390^(@)+cos(-660^(@))"sin"(-390^(@))=(1)/(2) .

Prove that: sin(-420^(@))(cos390^(@))+cos(-660^(@))(sin330^(@))=-1

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

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

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