Practice problem
=== If (f∘f)(x)=x(f \circ f)(x) = x(f∘f)(x)=x, then either f(x)=xf(x) = xf(x)=x or f(x)=−xf(x) = -xf(x)=−x.
True
False
Not enough information is given.
Type a concept, like “slope” or “photosynthesis”.
