acos(sqrt(3)/2)
Let's evaluate: acos(32)
ⓘ acos, asin and atan give the principal angle whose cosine, sine or tangent respectively equals the number, here a remarkable value: acos(32) = π6
▶Result:   π6
The numeric value of: π6 equals:
≈ 3.14166
▷ ≈ 0.5236