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What is the value of cosθ given that (−2, 9) is a point on the terminal side of θ?

9√85/85

−9√85/85

2√85/85

−2√85/85

r = √ [ x^2 + y^2 ] = √ [ ( -2)^2 + 9^2 ] = √85

cos θ = -2 / √85 = -2√85 / 85