# Linearize the Trigonometric Powers Part 3

Geometry Level 3

$\cos^4 \theta = a_4 \cos (4 \theta) + a_2 \cos (2 \theta) + a_0$

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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