Trigonometry
Write the given trigonometric function in terms of x.
cos 6x
16 cos6 x - 24cos4 x + 9cos2 x - 1
32 cos6 x - 48cos4 x + 18cos2 x + 1
32 cos6 x - 48cos4 x + 18sin2 x - 1
32 cos6 x - 48cos4 x + 18cos2 x - 1