lambda sin(x + 1)
<math xmlns="http://www.w3.org/1998/Math/MathML"> <lambda> <bvar> <ci>x</ci> </bvar> <apply> <sin/> <apply> <plus/> <ci>x</ci> <cn>1</cn> </apply> </apply> </lambda> </math>
Author: MathML 2 Recommendation