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\[ \cos^4 \theta = a_4 \cos (4 \theta) + a_2 \cos (2 \theta) + a_0 \]
Above shows a trigonometric identity for constants \(a_0, a_2, a_4 \).
What is the value of \(a_4 - a_2 + a_0 \)?
See Part 1, Part 2, and Part 4.
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