We'll consider a cube of unit length:

Vector OA = 1i + 1j + 1k

|OA| = (1^{2} + 1^{2} + 1^{2})^{(1/2)} = 3^{(1/2)}

Vector OB = 1i + 0j + 0k

Find the angle between a diagonal of a cube and one of its edges.

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