Question

tan x + 1 = sec theta

Answer 1

\[\sec^2 x = 1 + \tan^2 x\]
\[\rightarrow (\tan x +1)^2 = \tan^2 x + 1\]

Answer 2

Aren't I supposed to change tan x into sinx/cosx?

Answer 3

you could do that as well
there is more than 1 way to solve this