Mathematics

Mathematics

Problem

If

\mathbf{u}

and

\mathbf{v}

are unit vectors and

\theta

is the acute angle between them, then

2\mathbf{u} \times 3\mathbf{v}

is a unit vector for a. exactly two values of

\theta

b. more than two values of

\theta

c. no value of

\theta

d. exactly one value of

\theta

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