Show that if E is an elementary matrix, then ET is an elementary matrix of the same type as E.

2/26/18 Lecture Derivatives, Partial Derivatives, PDE Monday, February 26, 12:06 PM Challenge: Find infinitely many solutions to: Recall: Partial derivatives of f(x,y) at (a,b) Differential Equations 2/28/18 Lecture - Tangent Planes and Linear Approximations Wednesday, February 212:11 PM Challenge: Can you approximate arctan(0.9) using arctan(x+2y), with...