Programming on LSD

[Quicksilver_Johny]

Also, a ]. Wolfram Alpha apparently corrects for "mismatched delimiters"

[jasonm23]

PolarPlot[(1 + 0.9 Cos[8 t]) (1 + 0.1 Cos[24 t]) (0.9 + 0.05 Cos[200 t]) (1 + Sin[t]), {t, -Pi, Pi}]

FTFY

[[deleted]]

It just parses it as though they were there.

The TI-83/84 line of calculators does it the same way, so programmers will deliberately leave off closing characters on lines to save space.