1. π/6
2. π/4
3. π/3
4. π/2
π/6
1. 3/2,1/2
2. 1/2,0
3. 3/2,0
4. 3/2,1/3
3/2,1/2
1. 2-2sinAsinBsinC
2. 2+2sinAsinBsinC
3. 2-2cosAcosBcosC
4. 2+cosAcosBcosC
2-2cosAcosBcosC
1. (√5+1)/2
2. (√5+1)/8
3. (√5-1)/8
4. (√5-1)/2
(√5-1)/2
1. x
2. 4x
3. 2x
4. 3x
2x
1. 0
2. 1
3. -1
4. 2
0
1.
2.
3. 5
4. -5
1. 1+x+y+z
2. x+y+z
3. 0
4. 1
0
1. non-singular
2. singular
3. Skew symmetric
4. symmetric
singular
1. I-A
2. (I-A)/2
3. I+A
4. (I+A)/2
(I-A)/2