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

/* code_begins */

{{{
#29
x,y,z = var('x,y,z')

f = [cos(x)*cosh(y), -sin(x)*sinh(y), 0]

fx = f[0]
fy = f[1]
fz = f[2]

print diff(fx,x), diff(fy,x), diff(fz,x)
print diff(fx,y), diff(fy,y), diff(fz,y)
print diff(fx,z), diff(fy,z), diff(fz,z)}}}

/* code_ends */

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