Which property defines an odd function?
f(−x)=−f(x)f(-x) = -f(x)f(−x)=−f(x)
f(−x)=f(x)f(-x) = f(x)f(−x)=f(x)
f(x)=1/f(x)f(x) = 1/f(x)f(x)=1/f(x)
f(x+y)=f(x)+f(y)f(x+y) = f(x) + f(y)f(x+y)=f(x)+f(y)