Question

Tentukan nilai trigonometri sudut berikut
sin 570
cos 225
tan 300
cosec -60
sec 870
cotan 120

Answer 1

Sin 570 = ( k .360 + alfa) = ( 1 x 360 + 210 ) = sin 210 = sin ( 270 - 60) = - sin 60 = - 1/2 akar 3 Cos 225 = cos ( 270-45) = -cos 45 = - 1/2 akar 2 Tan 330 = tan (360-30) = - tan 30 = - 1/3 akar 3 Cosec 60 = cosec ( 90-30) = sec 30 = 2/3 akar 3 Sec 870 = ( k. 360+ alfa) = ( 2 x 360 + 150) = sec 150 = sec (180-30) = - sec 30 = - 2/3 akar 3 Ctg 120 = ctg (180-60) = - ctg 60 = - 1/3 akar 3 Semoga membantu :-)