Question

Give an example to show that the product of two one-to-one function is not necessarily a one-to-one function.

Answer 1

y=x
y=-x
y^2 = -x^2

Answer 2

Sorry I don't understand y^2=-x^2 ??
Shouldn't it be:(y)(y)=(x)(-x)
y^2 = -x ??

Answer 3

(x)(-x) = -x^2