greatwhiteshark
Full Member
- Joined
- May 8, 2005
- Messages
- 279
FIND: z/w
NOTE: d = degrees
z = 3(cos130d + i sin130d)
w= 4(cos270d + i sin270d)
MY WORK:
z = 3(cos130d + i sin130d)
--------------------------------
w= 4(cos270d + i sin270d)
z/w = 3/4 [cos(130d - 270d) + i sin(130d - 270d) ]
z/w = 3/4 [cos(-140d) + i sin(-140d) ]
z/w = 3/4 (cos320d + i sin320d)
BOOK"S ANSWER:
z/w = 3/4 (cos220d + i sin220d)
Where 220 degrees come from?
NOTE: d = degrees
z = 3(cos130d + i sin130d)
w= 4(cos270d + i sin270d)
MY WORK:
z = 3(cos130d + i sin130d)
--------------------------------
w= 4(cos270d + i sin270d)
z/w = 3/4 [cos(130d - 270d) + i sin(130d - 270d) ]
z/w = 3/4 [cos(-140d) + i sin(-140d) ]
z/w = 3/4 (cos320d + i sin320d)
BOOK"S ANSWER:
z/w = 3/4 (cos220d + i sin220d)
Where 220 degrees come from?