Question Number 25780 by rita1608 last updated on 14/Dec/17
$${every}\:{periodic}\:{function}\:{is}\: \\ $$$${differentiable}.{true}\:{or}\:{false}\:{justify} \\ $$
Answered by sushmitak last updated on 14/Dec/17
$${f}\left({x}\right)=\left\{{x}\right\}\:\:\left({fraxtional}\:{part}\:{of}\:{x}\right) \\ $$$${is}\:{periodic}\:{but}\:{not}\:{differtiable} \\ $$$${for}\:{x}\in\mathbb{Z} \\ $$