Let ABC be a triangle with area 36 square cm. If AB = 9 cm, BC = 12 cm and ∠ABC = θ, then what is cos θ equal to?

1
\(\frac{\sqrt{5}}{3}\)
2
\(\frac{\sqrt{5}}{4}\)
3
\(\frac{1}{3}\)
4
\(\frac{2}{3}\)

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