Question

1 per a+b + 1 per a-b

Answer 1

1/a+b + 1/a-b
= 1/a+b (a-b/a-b) + 1/a-b (a+b/a+b)
= a-b/(a^2-b^2 ) + a+b/(a^2-b^2)
= a-b+a+b / (a^2-b^2)
= 2a / (a^2-b^2)

# ^: pangkat