Find angle formed by two tangent lines to a circle from an external point.
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Question: Trigonometry and equation of a circle
Consider the circle with equation x^2+y^2-4y=0 and the point P(5,2). Draw a diagram to show the circle and the two lines from P that are tangent to the circle. Find the angle between the two tangent lines, angle APB, where A and B are the two points of contact.
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