I am having trouble with these questions-
Explain/prove whether:
(a) Any set {v1,v2,...vk} of orthogonal vectors in Rn is linearly independent.
(b) If there is a vector v in Rn and scalar c in R, we have ||cv|| = c||v||
(c) for any vectors u, v in Rn, ||u+v||^2 + ||u-v||^2 = 2 ||u||^2 +...