[" 42."(cos60^(@)+1)/(cot60^(@)-1)" का "],[[" (A) "-2," (B) "-3]]

(cos60 ^ (@) + 1) / (cos60 ^ (@) - 1) =

cot60^(@)xxtan30^(@)= ?

(log)_(sin30^(@)cos60^(@))=1

cos^(-1) sin (-60^(@))

4cos6^(@)cos42^(@)cos60^(@)cos78^(@)=

Show that: (cot 30^(@) cot 60^(@) - 1)/(cot 30^(@) + cot 60^(@)) = cot 90^(@)

Given that: A = cot 30^(@) and B = (cot60^(@) cot30^(@) +1)/(cot30^(@) - cot 60^(@)) , which of the relations stated below is true ?

"(1) "sin60^(@)cos30^(@)+sin30^(@)cos60^(@)