" 1) "tan20^(@)+tan40^(@)+sqrt(3)tan20^(@)tan40^(@)=a

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

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

Find tan 20^(@) + tan40^(@) + sqrt(3)tan20^(@)tan40^(@) .

A =(cos 9^(@) - sin 9^(@))/(cos 9^(@) + sin 9^(@)) , B = (cos 21^(@) + sin 21^(@))/(cos21^(@) -sin21^(@)) and C= tan 20^(@) + tan40^(@) + sqrt(3)tan20^(@) tan40^(@) then descending order is:

tan40^(@)+tan80^(@)-sqrt(3)tan40^(@)tan80^(@)=

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

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

tan 20^(@) + tan40^(@) + sqrt(3).tan 20^(@).tan 40^(@)=

tan 20^(@) + tan40^(@) + sqrt(3).tan 20^(@).tan 40^(@)= ................... A) (1)/(sqrt3) B) sqrt3 C) -(1)/(sqrt3) D) -sqrt3