Question

Let `"f"("x") = ("x" - 1)/("x" + 1),` then f(f(x)) is ____________.

पर्याय

• `1/"x"`

• `-1/"x"`

• `1/("x" + 1)`

• `1/("x" - 1)`

Answer 1

Let `"f"("x") = ("x" - 1)/("x" + 1),` then f(f(x)) is `underline(-1/"x")`.