355KiB, 1431x823, Untitled.png View SameGoogleiqdbSauceNAO Anonymous Sun 13 Oct 13:03:48 2019 No.11054874 ViewReplyOriginalReport Quoted By: >>11055078 >>11055210 >>11055223 how do I derive 9.53 and 9.54 from 9.51 and 9.52, I never took a class in PDE's. HELP