Trigonometry
Write the given trigonometric function in terms of x.
cos 8x
128sin8x - 256sin6x - 160sin4x - 32sin2x + 1
128sin8x - 256sin6x + 160sin4x - 32sin2x + 1
128sin8x + 256sin6x + 160sin4x - 32sin2x + 1
128sin8x - 256sin6x + 160sin4x + 32sin2x + 1