Recent content by sallaboy

thanks a lot !

ok ... but can I use the same technic when I have: x^2/(x+2) ?

Homework Statement x^2/(1-x) Homework Equations none The Attempt at a Solution I know I should use some kind of substitute but ... may t=1-x but what next ? any help will be helpfull thanks dimitry

Dear Tom, are there any ideas ? Please Advice, Dimitry Haritonov

Dear Tom, First of all I need to proove the two sides. so I've started with first side when ACB: (a,b)E(AUB)x(AUB) => aE(AUB) and bE(AUB) => if ACB so AUB=B => aEB and bEB => (a,b)E(BxB) the second side: (a,b)E(AxA)U(BxB) => here I have a little problem, I don't sure that I can to...

Hello, How do I proove : (A U B) x (A U B) = (A x A) U (B x B) if and only if : (A C B) or (B C A) ? Please Advice, Dimitry Haritonov