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(1+sec20^(@))(1+sec40^(@))(1+sec80^(@))=...

`(1+sec20^(@))(1+sec40^(@))(1+sec80^(@))=`

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(1+ sec 20^(0))(1+sec40^(0))(1+ sec80^(0))=

Find the value: sec20^(@) sec40^(@) sec80^(@)

The value of (1+sec20^(@)+cot70^(@))(1-"cosec"20^(@)+tan70^(@)) is equal to

sec^(-1)[sec(-30^(@))] =

sec^(-1)[sec(-30^(@))] =

The value of sec 40^(@)+sec 80^(@)+sec 160^(@) will be

The value of sec 40^(@)+sec 80^(@)+sec 160^(@) will be

sqrt(3)cos sec20^(0)-sec20^(@)

Prove that tan20^(@)+tan70^(@)=(sec^(2)20^(@))/(sqrt(sec^(2)20^(@)-1))