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

/* code_begins */

{{{
     t=linspace(0,8*pi,200)
r=exp(-.1*t)
x=r*cos(t)
y=r*sin(t)
clf
h1=axes([.1,.1,.5,.5])
fill(x,y,'g')
h2=axes([.45,.45,.3,.3])
fill(x,y,'b')
h3=axes([.67,.67,.2,.2])
fill(x,y,'m')
h4=axes([.84,.84,.1,.1])
fill(x,y,'r')

}}}

/* code_ends */

 * '''Solution by''': 
   * <telugu praveen kumar>, <student>, <snist>
   * <telugu praveen kumar>, <student>, <snist>