x=3cost
y=2sint
(16*x^2+81y^2)^(1%2)=(144*cost^2+324sint^2)^(1%2)
integral((144*cost^2+324sint^2)^(1%2))

}}}

Kreyszig-9.2_20-U (last edited 2010-12-18 10:34:28 by mamatha)