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sin420^(@)cos3x0^(@)-62(-300^(@))sin(-33...

sin420^(@)cos3x0^(@)-62(-300^(@))sin(-330^(@))

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

Find the values: (iii) sin 420^(@) cos 390^(@) - cos(-300^@) sin (-330^@)

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

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

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

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

What is the value of Sin420^@.cos390^@ + cos(-300^@). sin(-330^@ )?

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