Let A B C be a triangle. Point P lies in the interior of A B C such that \angle A B P=20^{\circ} and \angle A C P=15^{\circ}. Compute \angle B P C-\angle B A C.
Let A B C be a triangle. Point P lies in the interior of A B C such that \angle A B P=20^{\circ} and \angle A C P=15^{\circ}. Compute \angle B P C-\angle B A C.