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" Q16.Find the value of "sin(-420^(@))co...

" Q16.Find the value of "sin(-420^(@))cos(390^(@))+cos(-660^(@))sin(330^(@))

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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

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

Find the value of sin 420^@ cos 330^@ .

Find the value of :- sin390^@

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

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

Find the value of cos 390^(@)

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