Math question: In triangle ABC, angle B is bisected by line segment BD. If angle A measures 40 degrees, find the measure of angle B.
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Math question: What is the domain of a constant function f(x) = c, where c is any real number?
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What is the equation of an ellipse with a major axis parallel to the x-axis, center at (h, k), semi-major axis of length a, and semi-minor axis of length b? (