cos2x=1-tan^2x/1+tan^2x tan2x=2tanx/1-tan^2x
1/cos2x +tan2x
=(1+tan^2x/1-tan^2x)+(2tanx/1-tan^2x)
=(tanx+1)^2/1-tan^2x
=tanx+1/1-tanx
=2005