tan(pi/4+x)=1+tan x / 1-tan x

Question

Verify the following identities. Can you show a procedure please.

Answer 1

use the identity tan (a +b) = tan a + tan b/ 1-tanatanb let a = pi/4 and b=x

so this is tan(pi/4) +tanx / 1 - (1)tanx Tan of pi/4 =1

so 1+tan x/ 1-tanx