print "Solving differential equation representing Simple Harmonic 
 Motion"

#Declaring mass, time and spring constant as m, t and k 
 respectively
 m=var('m')
 t=var('t')
 k=var('k')

#Declaring displacement is fuction of time
 x = function('x',t)

#Assuming spring constant and mass are greater than zero
 assume(k>0)
 assume(m>0)

#Writing differential equation
 de= diff(x,t,2)+(k*x)/m

#Solving differential equation
 z = desolve(de,dvar=x,ivar=t)

#printing the result of differential equation
 print(z)