1. (1, -1)
2. (-1,1)
3. (-1,-1)
4. (1,1)
(1,1)
1. a
2. 3a
3. 7a/2
4. 2a
2a
1. -48
2. 0
3. -64
4. 16
0
1. x2+y2-4y+16=0
2. x2+y2-4x-12=0
3. x2+y2+4x+12=0
4. x2+y2-6x-12=0
x2+y2-4x-12=0
1. x+4a=0
2. x+2a=0
3. x+a=0
4. x+6a=0
x+4a=0
1. (x2/25)+(y2/9)=1
2. (x2/32)+(y2/16)=1
3. (x2/25)+(y2/7)=1
4. (x2/25)+(y2/12)=1
(x2/25)+(y2/9)=1
1. 8√2
2. 8
3. 16√2
4. 4√2
4√2
1. [cosα+cosβ]/[cos(α-β)]
2. [sinα-sinβ]/[sin(α-β)]
3. [cosα-cosβ]/[cos(α-β)]
4. [sinα+sinβ]/[sin(α+β)]
[sinα+sinβ]/[sin(α+β)]
1. (3,0)
2. (7/2,0)
3. (9/2,0)
4. (4,0)
(3,0)
1. 1/4
2. 2/3
3. 1/3
4. 1/2
1/3