Trig
posted by Kay .
Establish the identity:
1. sin0(cot0 + tan0) = sec0
2. cos0 +1/cos0 1 = 1 + sec0/1  sec0

1. sin x (cot x + tan x) =
sin x (cos x/sin x + sin x/cos x) =
cos x + (sin^2/cos x) =
[cos^2 x + sin^2 x]/cos x =
1/cos x
= sec x
You try the other one