tolong yaa bantuin no 8 sama 10

Mapel : Matematika
Kelas : X SMA
Bab : Trigonometri

Pembahasan :
8||

[Cos a + Cos a]/[- Cot a - cot a]
= [2Cos a]/[-2Cot a]
= - [Cos a]/[Cos a/Sin a]
= - [Sin a Cos a]/[Cos a]
= - Sin a
= - (Depan/Miring)
= - (2/√4+9)
= - (2/√13)
= - 2/13 √13

Jawaban : A

———————————————
10||

[Tan x . Cos x]/[Cos x . Tan x]
= 1

Jawaban : C