" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
0<x<2phi ( sesuai dengan soal)
dit : x ?
jb :
2 cos x + akar 2 =0
2 cos x = - akar 2
cos x = - akar 2/2
x = 135° dan 225°
cos 135° = -akar 2 /2
cos 225° = -akar 2/2