Mathematics · Trigonometry

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

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Let ABC be a triangle with an area of 36 square cm. If AB = 9 cm, BC = 12 cm, and &ang;ABC = &theta;, then what is cos &theta; equal to?