Chapter 13.2, Problem 2QCE

$\begin{array}{l}\left(\text{a}\right)\underset{\left(x,y\right)\to \left(3,2\right)}{\lim }x\cos \pi y=\text{\_\_\_\_\_\_\_\_}\\ \left(\text{b}\right)\underset{\left(x,y\right)\to \left(0,1\right)}{\lim }{e}^{xy}{}^{{}^2}=\text{\_\_\_\_\_\_\_\_}\\ \left(\text{c}\right)\underset{\left(x,y\right)\to \left(0,0\right)}{\lim }\left(x^2+y^2\right)\sin \left(\frac{1}{x^2+y^2}\right)=\text{\_\_\_\_\_\_\_\_}\end{array}$