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\frac{\left(a+b\right)\left(a-b\right)^{2}}{\left(-a+b\right)\left(-a^{2}+b^{2}\right)}-1
Cancel out -a+2b in both numerator and denominator.
\frac{\left(a+b\right)\left(a-b\right)^{2}}{\left(a-b\right)\left(-a+b\right)\left(-a-b\right)}-1
Factor the expressions that are not already factored in \frac{\left(a+b\right)\left(a-b\right)^{2}}{\left(-a+b\right)\left(-a^{2}+b^{2}\right)}.
\frac{-\left(-a-b\right)\left(a-b\right)^{2}}{\left(a-b\right)\left(-a+b\right)\left(-a-b\right)}-1
Extract the negative sign in a+b.
\frac{-\left(a-b\right)}{-a+b}-1
Cancel out \left(a-b\right)\left(-a-b\right) in both numerator and denominator.
\frac{-\left(-1\right)\left(-a+b\right)}{-a+b}-1
Extract the negative sign in a-b.
-\left(-1\right)-1
Cancel out -a+b in both numerator and denominator.
0
Combine -\left(-1\right) and -1 to get 0.