Let θ (in radians) be an acute angle in a right triangle and let x and y, respectively, be the lengths of the sides adjacent to and opposite θ. Suppose also that x and y vary with time.At a certain instant x=4 units and is increasing at 6 unit/s, while y=5 and is decreasing at 1/5 units/s.How fast is θ changing at that instant?

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