sin420^(@)cos390^(@)-cos(-300^(@))sin(-330^(@))

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

Find the values: (iii) sin 420^(@) cos 390^(@) - 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 sin(-420^(@))(cos390^(@))+cos(-660^(@))(sin330^(@))=-1

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

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

Find the value of sin 750^(@)cos300^(@)+cos1470^(@)sin(-1020^(@))

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