||'''Book'''|| Advanced Engineering Mathematics ||
 ||'''Author'''|| Erwin Kreyszig ||
 ||'''Edition'''|| 8th Edition ||

/* code_begins */

{{{
#a)
x, y = var('x, y')


plot_vector_field((x,x^3), (x,-100,100), (y,-100,100))
#b)
x, y = var('x, y')


plot_vector_field((1/y,1/x), (x,-100,100), (y,-100,100))
#c)
x, y = var('x, y')

plot_vector_field((((x^2+y^2)^-1)*x,-((x^2+y^2)^-1)*y ), (x,-100,100), (y,-100,100))
#d)

x, y = var('x, y')

plot_vector_field(((exp(x^2 + y^2))*x,-(exp(x^2 + y^2))*y ), (x,-20,20), (y,-20,20))
#e)
x, y = var('x, y')


plot_vector_field((cos(x),sin(x)), (x,-100,100), (y,-100,100))
}}}

/* code_ends */

 * '''Solution by''': 
  * ganesh, developer, space
  * bhanukiran, student, technical university of Delft
  * saransh, student, sobhit university