What is the derivative of the function f(x) = β«[0 to x^2] t^3 dt?
+
Math question: In triangle XYZ, angle X measures 60 degrees and angle Y measures 90 degrees. If the angle bisector of angle XYZ intersects side XZ at point P, find the measure of angle XPY.
+
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.