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[" 48."sin420^(@)cos390^(@)+cos(-300^(@)...

[" 48."sin420^(@)cos390^(@)+cos(-300^(@))sin(-330^(@))=?],[(a)11]

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

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

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

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

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) .

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

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

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