Chapter 11.12, Problem 18P

Computer plot graphs of sn u, cn $u$, and dn $u$, for several values of $k$, say, for example, $k=1/4,1/2,3/4,0.9,\mathrm{0.99.}$ Also plot $3\text{D}$ graphs of sn, cn, and dn as functions of $u$ and $k$.