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

/* code_begins */

{{{
var('a,t1,t2')
r=vector([a*cos(t1),a*sin(t1),t2])
print 'r=',
show(r)
show(diff(r,t1))
show(diff(r,t2))
}}}

/* code_ends */

 * '''Solution by''': 
   * Tony Lijo Jose, student, govt. Engineering college, Sreekrishnapuram
   * Syamkrishnan C K, student , govt. Engineering college, Sreekrishnapuram
   * Joe Philip Ninan, student, TIFR, Mumbai