9: The angle between the lines 2x – y + 3 = 0 and x +2y + 3 = 0 is
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Let m 1 and m 2 be the slope of the lines 2x − y + 3 = 0 and x + 2y + 3 = 0, respectively. Let be the angle between them. Therefore, the angle between the given lines is 90°.
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