aj me giai he phuong trinh thi zo

giai he phuong trinh :
siny - sinx = x - y
siny - sinz = z - y
x - y + z = pi
( so pi do ma o day ko co ki hieu so pi nen tao danh zay thong cam ha)

chan wa doi hoai ma chag thay aj wan tam het !!!!!!

giai lun ne : ta co :
sinx + x = sin + y
ma ham so sinx + x la ham tang nen suy ra x = y
tuong tu ta co y = z
nen tu phuong trinh cuoi ta suy ra x = y= z = pi