a) Show that fi (x) = cos x, f2(x) = cos 2x are orthogonal on [-7, n].

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A: We have to find functional value.

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A:

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A:

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A:

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A: As per bartleby guidelines we only give first question answers.

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Q: Show that fi (x) = cos x , f2(x) = cos 2x are orthogonal on [-7,71]. %3D

A: This is a application of integration problem