1. 1
2. 0
3. -1
4. √3
0
1. 1 – n2
2. 1 + n2
3. 1 – n
4. 1 + n
1 – n2
1. 3
2. 5
3. 7
4. 9
7
1. √3/4
2. √3/2
3. 2/√3
4. 4/√3
2/√3
1. -1/8
2. -1/4
3. 1/8
4. 1/4
1/8
1. ab/2
2. (a+b) /2
3. 2ab / (a2–b2)
4. 2ab / (a2+b2)
ab/2
1. 1+ k / 1-k
2. 1-k / 1+k
3. k+1 / k-1
4. k-1 / k +1
1+ k / 1-k
1. π/4
2. π/3
3. 2π/3
4. 3π/6
π/3
1. 5
2. 1/5
3. 5/14
4. 14/5
1/5
1. 1/e
2. e
3. e1/2
4. e2
e2