Statement
The exact value of the trigonometry functions of 30° and 60° are:
sin(30°)=21
cos(30°)=213
tan(30°)=313
sin(60°)=213
cos(60°)=21
tan(60°)=3
Proof
Construct triangle ABC with ∠A=∠B=∠C=60°. Then draw altitude CD on AB so that ∠C1=∠C2=30°, like the image below.

Let BD=m. Because this is an equilateral triangle, BC=2m.
Now find CD from the Pythagorean theorem:
CD=BC2−BD2=(2m)2−m2=4m2−m2=3m2=m3
Sine 30
From the triangle, note that sin(∠C2)=BCBD, so:
sin(30°)=2mm=21
Cosine 30
From the triangle, note that cos(∠C2)=BCCD, so:
cos(30°)=2mm3=213
Tangent 30
From the triangle, note that tan(∠C2)=CDBD, so:
tan(30°)=m3m=31=313
Sine 60
From the triangle, note that sin(∠B)=BCCD, so:
sin(60°)=2mm3=213
Cosine 60
From the triangle, note that cos(∠B)=BCBD, so:
cos(60°)=2mm=21
Tangent 60
From the triangle, note that tan(∠B)=BDCD, so:
tan(60°)=mm3=3