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[" Prove that "sin(-420^(@))(cos390^(@))...

[" Prove that "sin(-420^(@))(cos390^(@))+cos(-660^(@))(sin330^(@))=-1],[" Whe sure "]

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

Prove that: sin(-420^0)(cos390^0)+cos(-660^0)(sin330^0)=-1.

Prove that: sin(-420^0)(cos390^0)+cos(-660^0)(s in330^0)=-1.

Prove that sin(-420^0)cos(390^0)+cos(-660^0)(sin330^0)=-1

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

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

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

sin 420^(@) * cos 390^(@)- cos(-330^(@))* sin(-300^(@))=

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

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