Csc[z] gives the cosecant of z.

Simplify[expr] performs a sequence of algebraic and other transformations on expr, and returns the simplest form it finds. Simplify[expr, assum] does simplification using ...

Sin[z] gives the sine of z.

Abs[z] gives the absolute value of the real or complex number z.

Complex is the head used for complex numbers.

Element[x, dom] or x \[Element] dom asserts that x is an element of the domain dom. Element[{x_1, x_2, ...}, dom] asserts that all the x_i are elements of dom. Element[patt, ...

If[condition, t, f] gives t if condition evaluates to True, and f if it evaluates to False. If[condition, t, f, u] gives u if condition evaluates to neither True nor False.

ImageDeconvolve[image, ker] gives a deconvolution of image using kernel ker.

InverseErf[s] gives the inverse error function obtained as the solution for z in s = erf(z).

InverseJacobiCD[v, m] gives the inverse Jacobi elliptic function cd -1 (v \[VerticalSeparator] m).