Definition[symbol] prints as the definitions given for a symbol.

BodePlot[g] gives the Bode plot of a rational function g in one complex variable.BodePlot[sys] gives the Bode plot of a TransferFunctionModel or StateSpaceModel object ...

Special forms for some common symbols. This is equivalent to Sin[60Degree]. Here is the long form of the input.

At the core of Mathematica is its highly developed symbolic language, which unifies a broad range of programming paradigms and uses its unique concept of symbolic programming ...

Directly integrated into the Mathematica language is a convenient symbolic options mechanism that allows arbitrary sequences of named parameters to be given to both built-in ...

Sech[z] gives the hyperbolic secant of z.

SpheroidalJoiningFactor[n, m, \[Gamma]] gives the spheroidal joining factor with degree n and order m.

SpheroidalPSPrime[n, m, \[Gamma], z] gives the derivative with respect to z of the angular spheroidal function PS n, m (\[Gamma], z) of the first kind.

SpheroidalQSPrime[n, m, \[Gamma], z] gives the derivative with respect to z of the angular spheroidal function QS n, m (\[Gamma], z) of the second kind.

Density and contour plots. This gives a density plot of sin(x) sin(y). Lighter regions show higher values of the function. Some options for DensityPlot.