sin² x+cos²x=1 ⇒sin x=⁺₋√(1-cos² x)
tan x=sin x /cos x
sin x=⁺₋√(1-(1/2)²)=⁺₋√(1-1/4)=⁺₋√(3/4)=⁺₋√3 /2
so, sin x can be:
sin x=-√3 /2
sin x=√3 / 2
if sin x=-√3/2, then: tan x=(-√3/2) / 1/2=-√3.
if sin x=√3/2; then tan x =(√3/2) / (1/2)=√3.
Answer: if cos x=1/2; the sin of x can be equal to -√3 /2 or √3 /2; and tan x can be equal to -√3 or √3. it depends of the quadrant:
First quadrant: cos x=1/2; sin x=√3 /2; tan x=√3
fourth quadrant: cos x=1/2; sin x=-√3 /2; tan x=-√3
