# Let <span lang="E

We know that,

Where, x is the angle between two vectors

Applying for

Since angle between is acute cos x should be greater than 0

x2 – 4 > 0

x > 2 and x < –2

applying for

Since angle between is obtuse cos x should be less than

0

x2 – 9 < 0

x > –3 and x < 3

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