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[" 21."(sin(-660^(@))tan(1050^(@))sec(-4...

[" 21."(sin(-660^(@))tan(1050^(@))sec(-420^(@)))/(cos(225^(@))cos ec(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^@))=

sin42^(@)sec48^(@)+cos42^(@)cos ec48^(@)=2

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

(tan30^(@)cos ec60^(@)+tan60^(@)sec30^(@))=?

The value of (sin300^(@).tan330^(@).sec420^(@))/(tan135^(@).sin210^(@).sec315^(@)) is

The value of (sin300^(@).tan330^(@).sec420^(@))/(tan135^(@).sin210^(@).sec315^(@)) is

The value of (sin300^(@).tan330^(@).sec420^(@))/(tan135^(@).sin210^(@).sec315^(@)) is