Use this template to embed stand-alone formulae in wikitext. The mathematical capabilities of this template are very limited; use tables with class="texhtml" for formulae requiring non-linear layout.

{{bigmath|{{frac|∂²<VAR >f</VAR >|∂<VAR >r</VAR >²}} + {{frac|∂<VAR >f</VAR >|<VAR >r</VAR > ∂<VAR >r</VAR >}} + {{frac|∂²<VAR >f</VAR >|<VAR >r</VAR >²∂²<VAR >θ</VAR >}} {{=}} 0}} produces:

∂²fr² + frr + ∂²fr²∂²θ = 0

{{math}}