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Prove that sin(-420^0)(c0s390^0)+cos(-66...

Prove that `sin(-420^0)(c0s390^0)+cos(-660^0)(sin330^0)=-1`

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

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

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

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