" 4."tan40^(@)+tan80^(@)-sqrt(3)tan40^(@)tan80^(@)=

tan20^(@)-tan80^(@)+sqrt(3)tan20^(@)tan80^(@)=

Assertion (A): tan40^(@) + tan 80^(@) - sqrt(3)tan 40^(@) tan80^(@)=-sqrt(3) Reason ( R): tan( A + B) =tan A + tan B + tan(A + B) tan A tan B

tan20^(@)-tan80^(@)+sqrt(3)=

tan20^(@)+tan40^(@)+sqrt(3)tan20^(@).tan40^(@)=?

tan20^(@)tan30^(@)tan40^(@)tan80^(@)=1

Assertion (A) tan20^(@)+tan40^(@)+sqrt(3)tan20^(@)tan40^(@)=sqrt(3)Rason(R):If tan(A+B)=k, then tan A+tan B+k tan A tan B=0

tan20^(@)tan40^(@)tan80^(@)

tan20^(@)tan40^(@)tan60^(@)tan80^(@)

The value of tan20^(@)+tan40^(@)+sqrt(3)tan20^(@)tan40^(@) is