The order of the differential equation (d²y/dx²) + 2(dy/dx)+ sinx = 5 is-

2

The order of a differential equation is equal to the highest order derivative involved in differential equation so in given differential equation 

(d²y/dx²) + 2(dy/dx)+ sinx = 5 

the highest derivative is of order 2 so the order of given differential equation is 2.