Show that the familiar identities cos 3 x = 3/4 cos x + 1/4 cos 3x and
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Show that the familiar identities cos3 x = 3/4 cos x + 1/4 cos 3x and sin3 x = 3/4 sin x -1/4 sin 3x can be interpreted as Fourier series expansions. Develop cos4 x.
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Let xsin4 x and tcos4 x Fourier series expansion of cos4 x ...View the full answer
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