Find the angle θ\displaystyle \theta (where 0∘≤θ≤180∘\displaystyle {0}^{\circ}\leq\theta\leq{180}^{\circ}) between the following vectors. Give your answer accurate to at least 2 decimal places.
    u⃗=−7i⃗−4j⃗\displaystyle \vec{{u}}=-{7}\vec{{i}}-{4}\vec{{j}},     v⃗=3i⃗+12j⃗\displaystyle \vec{{v}}={3}\vec{{i}}+{12}\vec{{j}}

θ=\displaystyle \theta= °  

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