Question

A²b² + 2ab (a²+1) +a^2-b^2-1​

Answer 1

Exponentiation is not clear

If so Exponentiation

a²b²+2ab(a²+1)+a²-b²-1

this answer

a²b²+2a³b-b²+2ab+a²-1

As for if so Exponentiation

$a²b²+2ab(a²+1)+a² - b {}^{2 - 1}$

this answer

a²b²+2a³b+2ab+a²-b