Question

Prove that $\frac{a^{-1} }{a^{-1} +b^{-1} }$ + $\frac{a^{-1} }{a^{-1} -b^{-1} }$=$\frac{2b^{2} }{b^2-a^{2} }$

Answer 1

Answer:

..................... ........ ...........