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(a) show that {x, e^x, e^2x} is a linearly independed set. (b) Let A be a...

(a) show that {x, e^x, e^2x} is a linearly independed set.
(b) Let A be a 7x7 matrix
if r(A)=4. find det(A), explain
if det(A)=4, find r(A), explain
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