Math question: In triangle ABC, angle A is bisected by line AD. If angle B measures 60 degrees and angle C measures 40 degrees, find the measure of angle BAD.
+
Find the period of the trigonometric function y = 3cos(2x) - sin(4x) in terms of π.
+
Math Question: Find the limit as x approaches 2 of (x^2 - 4) / (x - 2).