Question Number 184175 by mnjuly1970 last updated on 03/Jan/23
Answered by SEKRET last updated on 03/Jan/23
$$ \\ $$
Commented by SEKRET last updated on 03/Jan/23
$$\:\:\boldsymbol{\mathrm{why}}.\:\boldsymbol{\mathrm{the}}\:\:\boldsymbol{\mathrm{picture}}\:\:\:\:\boldsymbol{\mathrm{uploaded}}\:\:\boldsymbol{\mathrm{is}}\:\:\boldsymbol{\mathrm{not}} \\ $$$$\:\:\:\boldsymbol{\mathrm{visible}}. \\ $$$$ \\ $$
Commented by HeferH last updated on 03/Jan/23
$${You}\:{need}\:{to}\:{press}\:\bullet\bullet\bullet\:{and}\:{select}\:``{attach}\:{image}'' \\ $$$$\:{if}\:{you}\:{do}\:{it}\:{inside}\:{a}\:{file}\:\left(``{insert}\:{drawing}''\:\right. \\ $$$$\left.\:{option}\right)\:{it}\:{will}\:{not}\:{show}.\: \\ $$
Commented by SEKRET last updated on 04/Jan/23
$$\boldsymbol{\mathrm{tkanks}}\:\boldsymbol{\mathrm{sir}} \\ $$
Answered by TheSupreme last updated on 03/Jan/23
$$\lfloor{x}\rfloor{sin}^{\mathrm{2}} \left({x}\right)\:\:{is}\:{continue}\:{in}\:\mathbb{R}−\mathbb{Z} \\ $$$$\forall{x}\in\mathbb{R}−\mathbb{N} \\ $$$$\frac{{df}}{{dx}}=\mathrm{2}\lfloor{x}\rfloor{sin}\left({x}\right){cos}\left({x}\right)=\mathrm{0}\:\rightarrow\:{x}={k}\frac{\pi}{\mathrm{2}}\:\forall{k}\in\mathbb{Z} \\ $$$${x}_{{crit}} =\:{k}\:\frac{\pi}{\mathrm{2}} \\ $$