Question

rationalising if a^-1 -b^-1​

Answer 1

Answer:

$= {x}^{ - 1} - {y}^{ - 1} \\ = \frac{1}{x} - \frac{1}{y} \\ = \frac{y - x}{xy}$

Answer 2

$\huge\frak\red{Answer}$

x-1 - y-1

= 1/x - 1/y

= y-x/xy