Discover Questions

How to solve this 2nd order differential equation x²(d²y/dx²)+4x(dy/dx)+2y=ln x, x>0
using substitution x=e^u? What is the advantage of the Welch t test over Student’s t test? 1interval0 x-8/x^2-7x+10 dx? How can a star be churned to prevent the formation of an iron core? What are Keck observatories lasers for?