1<math xmlns='http://www.w3c.org/mathml' version='2.0'> 2 <apply> <eq/> 3 <apply> <diff/> 4 <bvar> <ci> x </ci> </bvar> 5 <apply> <times/> 6 <ci> a </ci> 7 <ci> u </ci> 8 </apply> 9 </apply> 10 <apply> <times/> 11 <ci> a </ci> 12 <apply> <diff/> 13 <bvar> <ci> x </ci> </bvar> 14 <ci> u </ci> 15 </apply> 16 </apply> 17 </apply> 18</math> |