`tan 203^(@) + tan 22^(@) + tan 203^(@) tan 22^(@)` =

(tan 23^(@) + tan 22^(@))/(1- tan23^(@) * tan 22^(@))=

tan203^(@)+tan22^(@)+tan203^(@)tan22^(@)=

tan 22½º

tan 22^@ - tan 68^@

tan10^(@) tan 20^(@) tan 30^(@) tan 40^(@) tan 50^(@) tan 60^(@) tan 70^(@) tan 80^(@)=

The value of tan203^(@)+tan22^(0)+tan203^(0)tan22^(0) is (A)-1 (B) 0(C)1(D)2

Without using tables, evaluate the following: 3 cos 68^(@) . "cosec" 22^(@) - (1)/(2) tan 43^(@) .tan 47^(@) .tan 12^(@).tan 60^(@).tan 78^(@) .