ada yg tau jwb kha..??

f(x) = sin^2 (8x - π) = [sin (8x - π)]^2
f'(x) = 2 sin (8x - π) cos (8x - π) . 8
= 16 sin (8x - π) cos (8x - π)

atau bisa diuraikan lagi menjadi

= 8 . 2 sin (8x - π) cos (8x - π)
= 8 sin 2(8x - π)
= 8 sin (16x - 2π)