Problems
2015年6月29日 - 31st, 2014. Solve the ODE y + xe− x2. 2. = 0. Solution: y = dy dx. = -xe− x2. 2 ..... y = -5y. 1. 2. What will the level curves f(x, y) = const (also called isoclines, of equal incli- nation) of an ..... ydx + (y + tan(x + y))dy = 0 knowing ...