Pregunta: Find all the second partial derivatives. f(x,y)=(sin(mx+ny))2fxx(x,y)=fxy(x,y)=fyx(x,y)=fyy(x,y)=

We have to calculate the partial derivatives of $\mathrm{f}(\mathrm{x},\mathrm{y})={\left(\sin (\mathrm{m}\mathrm{x}+\mathrm{n}\mathrm{y})\right)}^2$

${\mathrm{f}}_{\mathrm{x}\mathrm{x}}(\mathrm{x},\mathrm{y})=?$

Sol: Differentiate f(x,y) partially ...