The equation involving derivatives of dependant variable with respect to independent variable is called differential equation. Here we see y=asin(x+b) , a & b are called arbitrary constant .(means any constant) and the given equation is called general solution. if we replace a & b by some fixed value then the value is called particular constant and the equation is called particular equation. There are some solutions which cannot be obtain from the general solution by taking particular values of the orbitrary constant.such solution is known as singular solution.