Use "function" to solve in matlab

For equation z$(x,y)=(sin(0\mathrm{.}3x)+0\mathrm{.}5)(1+\frac{1}{1+co{s}^2(y)})$ with the intervals $0x$

and $0y$ and an increment of $0\mathrm{.}1,$ plot wire$-$framed $3$D plot with contour graph. Save the

plot as Problem $3.$