CoshIntegral[z] gives the hyperbolic cosine integral Chi(z).

CosIntegral[z] gives the cosine integral function Ci(z).

CountRoots[poly, x] gives the number of real roots of the polynomial poly in x.CountRoots[poly, {x, a, b}] gives the number of roots between a and b.

Cuboid[{x_min, y_min, z_min}] is a three-dimensional graphics primitive that represents a unit cube, oriented parallel to the axes. Cuboid[{x_min, y_min, z_min}, {x_max, ...

Dashing[{r_1, r_2, ...}] is a two-dimensional graphics directive specifying that lines that follow are to be drawn dashed, with successive segments of lengths r_1, r_2, ... ...

DatePlus[date, n] gives the date n days after date.DatePlus[date, {n, " unit"}] gives the date n units after date.DatePlus[date, {{n_1, "unit_1"}, {n_2, "unit_2"}, ...}] ...

Decompose[poly, x] decomposes a polynomial, if possible, into a composition of simpler polynomials.

DifferentialRootReduce[expr, x] attempts to reduce expr to a single DifferentialRoot object as a function of x.DifferentialRootReduce[expr, {x, x_0}] takes the initial ...

DirectedInfinity[] represents an infinite numerical quantity whose direction in the complex plane is unknown. DirectedInfinity[z] represents an infinite numerical quantity ...

Disjunction[expr, {a_1, a_2, ...}] gives the disjunction of expr over all choices of the Boolean variables a_i.