1. 3
2. 6
3. 9
4. 12
6
1. 0
2. 1
3. -1
4. 1/√2
0
1. (n2+1)yn
2. (n2-1)yn
3. n(n2-1)yn
4. n(n+1)yn
n(n+1)y<sub>n</sub>
1. [(π/4)+(1/2)log2]
2. [(π/2)+(1/4)log2]
3. [(π/4)+(1/4)log2]
4. [(π/2)+(1/2)log2]
[(π/2)+(1/4)log2]
1. 0
2. π/4
3. π/2
4. -(π/4)-1
0
1. (2/n-1) cos(n-1)x
2. (2/n-1) sin(n-1)x
3. (2/n) cos nx
4. (2/n) sin nx
(2/n-1) sin(n-1)x
1. 2
2. 3
3. 4
4. 5
4
1. y-x=c(1+xy)
2. y+x=c(1+xy)
3. y+x=c(1-xy)
4. y-x=c(1-xy)
y-x=c(1+xy)
1. -3:2
2. 1:2
3. 2:3
4. -4:3
1:2