If P + 1+P = x and P - 1/P then the relation between x and y is : 1. x2 = y2 2. x2 + y2 = 4 3. x2 - y2 = 4 4. xy = 2

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If x + y + z = 0, then x³ + y³ + z³ =
xyz
3xyz
27xyz
0

2.51 × 2.51 + 1.31 × 1.31 − 2.62 × 2.51 =
1.44
0.44
1
0