For each statement, explain why it must be true, or use an example to show that it can be false. - If y=f(z) has a horizontal tangent line at a: = 1 then y=g(z). where g(z) = fl3_ 1) +1. has a hurl'zuntal tangent line at n: =2. - A tangent line always has exactly one point in common with the graph at the function