Question

@Mujee
@Love2solve
@Db45


Tolong bantuannya ya kak

1-tan^2(x/2) per 1+tan^2(x/2) sama dengan....
A.sin x
B.cot x
C.cos x
D.tanx
E.sec x

Answer 1

(1 - tan^2 (x/2))/(1 + tan^2 (x/2))
= (1 - tan^2 (x/2))/(sec^2 (x/2))
= (cos^2 (x/2))(1 - tan^2 (x/2))
= cos^2 (x/2) - sin^2 (x/2)
= cos 2(x/2)
= cos x

Jawab: C