I can't figure this out. The equation is . Solving for y', I get y1 = 2ix + c1 and y2 = -2ix + c2.

Then v = y1 - 2ix and w = y2 + 2ix.

I keep getting and from the second partials with respect to x twice and y twice, respectively. This doesn't tell me anything, because these two equations are equivalent. Please advise.