Let B = { 1, cos t, cos 2 t, cos 3 t, cos 4 t } and C = { 1, cos t, cos 2 t, cos 3 t, cos 4 t } and assume the following identities: Let H = S p a n { B }. Prove that C is another basis for H by

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The standard way of proving that something is a basis is to prove that it is linear independent and that it spans the vector space. Of course, sometimes there are shortcuts.

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In mathematics, a set B of vectors in a vector space V is called a basis if every element of V may be written in a unique way as a finite linear combination of elements of B. The coefficients of

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