Answer:by make it in simple form
Step-by-step explanation:we firstly should start from 1st expression.Even by using algebra formula for ex:
=a/(a^2 -b^2) +(b/(a^2 -b^2)
=(a+b)/(a^2 -b^2)
=(a+b) / ((a+b)(a-b))
=1/(a-b)
