dg menggunakan identitas trigonometri tan x. sin x + cos x =

tan x = sin x /cos x

tan x , sin x + cos x =
= sin x /cos x (sin x)  + cos x
= (sin² x) / cos x  + cos x
= (sin² x)/ cos x + (cos² x)/cos x
= (sin² x + cos² x)/cos x
= 1/cos x
= sec x

Trigonometri.
Kelompok wajib kelas X kurikulum 2013 revisi 2016.

tan x sin x + cos x
= (sin x / cos x) sin x + cos x
= (sin² x + cos² x) / cos x
= 1 / cos x
= sec x