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" E "4" rove that ":sin(-420^(@))(cos390...

" E "4" rove that ":sin(-420^(@))(cos390^(@))+cos(-660^(@))(sin330^(@))=-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

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.

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

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