Practice:Charenninful/My Practice Area


 * 1) &ne;
 * 2) &le;
 * 3) &radic;
 * 4) &int;
 * 5) &int;(x-y)
 * 6) &sum;(x-y)
 * 7) &sum;(x-y)2
 * 8) &sum;(x-y)a-b