$\vec{b}$

$\vec{a}$

B = (-2, 2, 1)
C: (-3 | 1 | -1)
b = Vector(C, B)
A: (3 | 3 | 0)
a = Vector(C, A)
α = Angle(a, b, xOyPlane)
c: (a * b)
Text1: "\vec{a} \cdot \vec{b} = \left(\begin{array}{c} " + (LaTeX[x(a)]) + " \\ " + (LaTeX[y(a)]) + " \\ " + (LaTeX[z(a)]) + " \end{array}\right) \cdot \left(\begin{array}{c} " + (LaTeX[x(b)]) + " \\ " + (LaTeX[y(b)]) + " \\ " + (LaTeX[z(b)]) + "\end{array}\right) = " + (LaTeX[c]) + ""