Sing Practice Questions & Answers

The value of, $\frac{1}{a^2 +ax + x^2}- \frac{1}{a^2 - ax + x^2} +\frac{2ax}{a^4 + a^2x^2 + x^4}$ is

The value of, $\frac{1}{a^2 +ax + x^2}- \frac{1}{a^2 - ax + x^2} +\frac{2ax}{a^4 + a^2x^2 + x^4}$ is,

1. 2
2. 1
3. -1
4. 0