Answer
$-1$
Work Step by Step
RECALL:
(i) $\dfrac{a^m}{a^n} = a^{m-n}$
(ii) $a^0=1, a\ne0$
Divide the coefficients, and then use the rules above to obtain:
$=-a^{1-1}b^{1-1}
\\=-a^0b^0
\\=-(1)(1)
\\=-1$
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