Announcements
**January 21** - Office hours are now in the syllabus (link below).

**December 8** - The book assumes some familiarity with the hyperbolic functions. You need to know the definitions of sinh and cosh. The definitions of the other four hyperbolic functions follow in a manner analogous to the trigonometric functions: tanh=sinh/cosh, sech=1/cosh, and so on. Also know the derivatives of sinh and cosh, which are easy: sinh'(t)=cosh(t), which is like sin'(t)=cos(t), and cosh'(t)=sinh(t), which is *almost* like cos'(t)=-sin(t). See this page for the full lowdown on hyperbolic functions.