Chapter 11.5, Problem 7PS

a.

To determine

To find $\frac{dz}{dt}$ where $z=f\left(x,y\right)$ , for given $f\left(x,y\right)$ by expressing z in terms of t

b.

To determine

To find $\frac{dz}{dt}$ where $z=f\left(x,y\right)$ , for given $f\left(x,y\right)$ by using chain rule