Sin 4/3 pi - cos 3/4 pi + sin 2/3 pi - cos 3/4 pi Tolobg cepat ulangan

pi = 180

sin (4/3)180 - cos (3/4)180 + sin (2/3)180 - cos (3/4)180
= sin 240 - cos 135 + sin 120 - cos 135
= - ½√3 - (-½√2) + ½√3 - (-½√2)
= √2