Question

please answered it
.......

Answer 1

Step-by-step explanation:

18)

$f(x) = 1 - \frac{1}{x} \\ then \\ \\ f(f( \frac{1}{x} )) = f(1 - \frac{1}{ \frac{1}{x} }) \\ \\ = f(1 - x) \\ \\ = 1 - \frac{1}{1 - x} \\ \\ = \frac{1 - x - 1}{1 - x } \\ \\ - \frac{x}{1 - x} \\ ans....$

$19th \\ f(x) = \frac{1 - x}{1 + x} \\ \\ f(2x) = \frac{1 - 2x}{1 + 2x} \\ \\ \frac{1}{f(x)} = \frac{1}{ \frac{1 - x}{1 + x} } \\ = \frac{1 + x}{1 - x}$

Here in 19th que..there is same concept applies..

put in the value in RHS so you will get the ans....

Thank you