## Question

###### Prove that the set {1, cos X, cos 2x, '} is orthogonal on the interval [~n,n].Express the polynomial z2 + x _ 1 in terms of the base {1, â‚¬, (3x2 _ 1)}

Prove that the set {1, cos X, cos 2x, '} is orthogonal on the interval [~n,n]. Express the polynomial z2 + x _ 1 in terms of the base {1, â‚¬, (3x2 _ 1)}

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