Are the following statements True or False?

? 7. If f has a removable discontinuity at x = 3, then f' must also have a removable discontinuity at c = 3. ? 8. When a rational function f (x ) has an asymptote y = c for x -> too, then f(x ) must also have the same asymptote y = c for x -> -oo; however, this is not necessarily true for a general function f(x). ? 9. If f is periodic, then f' is periodic. ? 10. If f is even, then d da [x f (x)] is also even