TeXForm

Exports an expression to TeX format

TeXForm[expr_]

Examples

Series[Sin[x], {x,0,5}] // Normal // TeXForm

output

"\\frac{x^5}{120}-\\frac{x^3}{6}+x"

One can directly render it using built-in LaTeX support in Markdown cells or LaTeX cells. Or alternatively via CellView

CellView[StringJoin[
  TeXForm[Series[Sin[x], {x,0,7}] // Normal]
], "Display"->"latex"]

Using ToExpression one can parse TeX to Wolfram Language

ToExpression["\\frac{x^5}{120}-\\frac{x^3}{6}+x", TeXForm]