1. 0
2. αβ
3. (1/4)(α-β)2
4. -(1/4)(α-β)2
-(1/4)(α-β)2
1. π/6
2. π/4
3. π/3
4. π/2
π/2
1. 2x+y = 3
2. x+2y = 3
3. x+y = -1
4. x+y+2 = 0
x+2y = 3
1. 2/3
2. 4/3
3. 8/3
4. 10/3
8/3
1. 3x+4z =12
2. 3z+4x =12
3. 3y+4z =12
4. 3z+4y =12
3z+4y =12
1. 10
2. 12
3. 49/4
4. 55/4
49/4
1. 2x+5y+z-8=0
2. x+y-z-1=0
3. 2x+5y+z+4=0
4. x-y+z-1=0
x-y+z-1=0
1. 21
2. -21
3. 23
4. -23
-23
1. (7,-8)
2. (-7,8)
3. (7,8)
4. (-7,-8)
(-7,8)
1. xux=yuy
2. yux=xuy
3. yux+xuy=0
4. x2uy+y2ux=0
yux+xuy=0