[(sin(-660^(@))tan(1050^(@))sec(-420^(@)...

[(sin(-660^(@))tan(1050^(@))sec(-420^(@)))/(cos(225^(@))cos cos(315^(@))cos(510^(@)))=],[[" 1) "(sqrt(3))/(4)," 2) "(sqrt(3))/(2)," 3) "(2)/(sqrt(3))," 4) "(4)/(sqrt(3))]]

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( sin (-660^(@)) tan (1050^(@)) sec (-420^(@)))/(cos(225^(@)) "cosec"(315^(@)) cos (510^(@)))=

(sin(-660^@)tan(1050^@)sec(-420^@))/(cos(225^@)cosec(315^@)cos(510^@))=

The value of (sin(-660^(@))tan(1050^(@))sec(420^(@)))/(cos(225^(@))cos ec(315^(@))cos(510^(@)))is :

(sin(-660^@)tan(1050^@).sec(420^@))/(cos(225^@)cosec(315^@)cos(510^@))=

cos 225^(@)+ sin 165^(@)=

cos510^(@)cos330^(@)+sin390^(@)cos120^(@)

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

cos225^(@)+sin195^(@)=

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

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