||'''Book'''|| Linear Algebra ||
 ||'''Author'''|| Gilbert Strang ||
 ||'''Edition'''||  ||

/* code_begins */

{{{
a=vector([3,4])
b=vector([4,3])
p=a.dot_product(b)/(a.norm() * b.norm())
print p
float(arccos(p))
}}}

/* code_ends */

 * '''Solution by''': 
   * <C.Pratyusha>, <student>, <SNIST>
   * <Reepu kumari>, <student>, <SNIST>
   * <Renuka.Y>,<student>,<SNIST>