What is the equation of the ellipse with a major axis parallel to the x-axis, center at (h, k), horizontal radius a, and vertical radius b?
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What is the range of the constant function f(x) = c, where c is a real number?
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Question: In triangle ABC, if the measure of angle A is 60Β° and the angle bisector of angle A intersects BC at point D, find the measure of angle BDC.