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Suppose A is a symmetric positive definite matrix of size n n with eigenvalues arranged in descending order. Prove the following inequality for all vectors

Suppose A is a symmetric positive definite matrix of size nn with eigenvalues arranged in descending order. Prove the following inequality for all vectors uinRn where ||u||2=1 :
2uTAu2uTAA-1u21n2+n12
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