Question

Prove that:-
$(\frac{a}{b})^{-1} = \frac{b}{a}$

Answer 1

$\large\frac{a}{b}^{-1}=\frac{b}{a}$

LHS = (a/b)^-1 = a^-1/b^-1 = 1/a/1/b = b/a

RHS = b/a

Hence proved.