The value of \(\mathop {\lim }\limits_{{\rm{x}} \to 0} \left( {\frac{{ - \sin {\rm{x}}}}{{2\sin {\rm{x}} + {\rm{x}}\cos {\rm{x}}}}} \right)\) is ________
Enter numerical value using the virtual keypad. Round off where necessary.
Enter numerical value using the virtual keypad. Round off where necessary.