Unit Vector in the Same Direction

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What is the unit vector in the same direction as the vector v = 3i - 4j?

$\frac{1}{3}i - \frac{1}{4}j$

$\frac{3}{7}i - \frac{4}{7}j$

$\frac{3}{5}i - \frac{4}{5}j$

3i - 4j

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