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

/* code_begins */

{{{
bn,n =var('bn,n')
# f(x) is odd as seen by the figure
bn=2/pi*(integral(3*x*(pi^2-x^2)*cos(n*x),x,-pi,pi))
print 'bn=',bn

#Plotting the function
x=var('x')
f1=function('f1',x)
f1=3*x*(pi^2-x^2)
f1.plot(xmin=-pi,xmax=pi)
}}}

/* code_ends */

 * '''Solution by''': 
   * Snehal Mitragotri, Ex-student, IIT Roorkee
   * Aashita Kesarwani, Student, IIT Roorkee
   * Tale PrafullKumar, Student, IIT Roorkee