Tolong bantu menyelesaikan pertanyaan di atas :)

Bab Trigonometri
Matematika SMA Kelas X

1] (1 - cos² x) / (cos x . sin x)
= sin² x / (cos x . sin x)
= (sin x . sin x) / (cos x . sin x)
= sin x / cos x
= tan x

terbukti

2] (tan x - cot x) / (tan x + cot x)
= (sin x / cos x - cos x / sin x) : (sin x / cos x + cos x / sin x)
= ((sin² x - cos² x) / (sin x . cos x)) : (sin² x + cos² x)/(sin x . cos x))

** sin² x + cos² x = 1
** coret sin x . cos x

= sin² x - cos² x
= sin² x - (1 - sin² x)
= sin² x -1 + sin² x
= 2 sin² x - 1