sin420^(@)=

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4sin(420^(@)-alpha)cos(60^(@)+alpha)=

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

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

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

4 sin (420^(@) - alpha ) cos (60^@ + alpha ) =

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

cos 690^(@) * sin 840^(@) + cos 420^(@) * sin 1050^(@)=

Prove that cos420^@ sin390^@+cos(-300^@)sin(450^@)=3/4