Question Number 216542 by Davidtim last updated on 10/Feb/25
$${if}\:{y}={cosu}\:{then}\:{prove}\:{that}\:{y}'={sinu}\centerdot{u}' \\ $$$${by}\:{newton}'{s}\:{formula}. \\ $$
Commented by Davidtim last updated on 11/Feb/25
$${please}\:{solve}\:{the}\:{problem}. \\ $$