What is the formula of (1 - cos x)/ sin x?

Dividing (2) by (1)

(1 - cos x) / sin x = 2sin² (x/2) / 2sin (x/2).cos (x/2)

By taking 2 sin (x/2) as common

(1 - cos x)/sin x = sin (x/2)/cos (x/2)

As sin x/ cos x = tan x

(1 - cos x)/sin x = tan (x/2)

Therefore, when asked What is the formula of (1 - cos x)/ sin x? then the answer will be the formula of (1 - cos x)/sin x = tan (x/2)

Summary:

What is the formula of (1 - cos x)/ sin x?

The formula of (1 - cos x)/sin x = tan (x/2).