saya minta tolong cara mengerjakan no 4 soalnya saya belum paham(tolong di isi ya soalnya bsk di kumpulin)

Lim (1 - cos^2 (x - 2)) / (3x^2 - 12x + 12)
= Lim (sin^2 (x - 2)) / 3(x^2 - 4x + 4)
= Lim (sin^2 (x - 2)) / 3(x - 2)(x - 2)
= Lim 1/3 . (sin (x - 2))/(x - 2) . (sin (x - 2))/(x - 2)
= 1/3 . 1 . 1
= 1/3

^ = pangkat