Question 1001762
cos^2x*tan x+ sin^2 x + tan x=
tan x( cos^2 x+sin^2 x).  But cos^2 x+ sin^2 x=1
all divided by sinx
tan x/sin x
but tan x =sin x/ cos x

(sinx /cos x) divided by sin x
=1/cos x=
sec x.