Again ecesider the function

$f(x,y)=e^{\frac{x}{4}}cos(y)$

$($a$)$ Conalder the cross$-$section of $f(x,y)$ at $y=\frac{}{4}.$ Find and graph this $1-$variable function. $($Be sure to label your aweel$)$

$($b$)$ Find the slope of the tangent at $x=0$ to the function you found is $($a$).$

$($c$)$ Expess your asswer to $($b$)$ in terma of partial derivatives and check that it nerve ville $($b$).$

$($d$)$ Bhosily your samer to $3$b be the same as to $2$b$?$ Why or shy nad?