Recent content by phamdat1202

Homework Statement the circle travels clockwise from (0,-1) to (0,1) write down the parameterization in term of tHomework Equations The Attempt at a Solution x=cost(t) y=-sin(t) i'm not sure about the sign of the polar coordinate, how to find the sign?

thanks, got it

i know after i got eigenvalues, i can find eigenvectors which is P. my question is that in my solution, P are normalised eigenvectors. why they use normalised eigenvector instead of the eigenvector?

Homework Statement A= [1 -1 0] [-1 2 -1] [0 -1 1] find orthogonal matrix P and diagonal matrix D such that P' A P = D Homework Equations The Attempt at a Solution i got eigenvalues are 0, 1, 3 which make D=[0 0 0; 0 1 0; 0 0 3] how to find P. because in...